| myxobacteria | (noun) bacteria that form colonies in self-produced slime; inhabit moist soils or decaying plant matter or animal waste | Synonyms: gliding bacteria, myxobacter, myxobacterium, slime bacteria |
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| myxobacterium | (noun) bacteria that form colonies in self-produced slime; inhabit moist soils or decaying plant matter or animal waste | Synonyms: gliding bacteria, myxobacter, myxobacteria, slime bacteria |
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| nabob | (noun) a wealthy man (especially one who made his fortune in the Orient) | - |
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| (noun) a governor in India during the Mogul empire | Synonyms: nawab |
| necrobiosis | (noun) (physiology) the normal degeneration and death of living cells (as in various epithelial cells) | Synonyms: cell death |
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| neobaroque | (noun) art or architecture based on study of 17th century baroque. | Synonyms: neo-baroque |
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| neobehaviorism | (noun) a school of psychology based on the general principles of behaviorism but broader and more flexible in concept. It stresses experimental research and laboratory analyses in the study of overt behavior and in various subjective phenomena that cannot be directly observed and measured, such as fantasies, love, stress, empathy, trust, and personality. | - |
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| neophobia | (noun) a morbid fear of novelty | - |
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| nephroblastoma | (noun) malignant renal tumor of young children characterized by hypertension and blood in the urine and the presence of a palpable mass | Synonyms: adenomyosarcoma, embryoma of the kidney, Wilms' tumor, Wilms tumour |
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| neurobiologist | (noun) a specialist in neurobiology | - |
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| neurobiology | (noun) the branch of biology that deals with the anatomy and physiology and pathology of the nervous system | - |
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| neuroblast | (noun) a cell from which a nerve cell develops | - |
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| neuroblastoma | (noun) malignant tumor containing embryonic nerve cells; usually metastasizes quickly | - |
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| niobite | (noun) a black mineral that is an ore of niobium and tantalum | Synonyms: columbite |
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| niobium | (noun) a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium | Synonyms: atomic number 41, Nb |
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| nitrobacteria | (noun) soil bacteria that convert nitrites to nitrates | Synonyms: nitric bacteria |
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| nitrobacterium | (noun) any of the bacteria in the soil that take part in the nitrogen cycle; they oxidize ammonium compounds into nitrites or oxidize nitrites into nitrates | - |
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| nitrobenzene | (noun) a poisonous oily water-soluble liquid used as a solvent and in the manufacture of aniline | - |
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| nitrosobacteria | (noun) soil bacteria that oxidize ammonia to nitrites | Synonyms: nitrous bacteria |
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| nob | (noun) informal term for an upper-class or wealthy person | Synonyms: toff |
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| nobelium | (noun) a radioactive transuranic element synthesized by bombarding curium with carbon ions; 7 isotopes are known | Synonyms: atomic number 102, No |
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| nobility | (noun) the quality of elevation of mind and exaltation of character or ideals or conduct | Synonyms: grandeur, magnanimousness, nobleness |
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| (noun) a privileged class holding hereditary titles | Synonyms: aristocracy |
| (noun) the state of being of noble birth | Synonyms: noblesse |
| noble | (noun) a titled peer of the realm | Synonyms: Lord, nobleman |
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| nobleman | (noun) a titled peer of the realm | Synonyms: Lord, noble |
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| nobleness | (noun) the quality of elevation of mind and exaltation of character or ideals or conduct | Synonyms: grandeur, magnanimousness, nobility |
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| noblesse | (noun) members of the nobility (especially of the French nobility) | - |
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| (noun) the state of being of noble birth | Synonyms: nobility |
| noblewoman | (noun) a woman of the peerage in Britain | Synonyms: Lady, peeress |
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| nobody | (noun) a person of no influence | Synonyms: cipher, cypher, nonentity |
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| nonobservance | (noun) a lack of conformity with law or custom or practice etc. | - |
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| novobiocin | (noun) an antibiotic obtained from an actinomycete and used to treat infections by Gram-positive bacteria | - |
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| nyctophobia | (noun) a morbid fear of night or darkness | - |
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| obbligato | (noun) a part of the score that must be performed without change or omission | Synonyms: obligato |
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| (noun) a persistent but subordinate motif | Synonyms: obligato |
| obduracy | (noun) resoluteness by virtue of being unyielding and inflexible | Synonyms: adamance, unyieldingness |
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| obeah | (noun) a religious belief of African origin involving witchcraft and sorcery; practiced in parts of the West Indies and tropical Americas | Synonyms: obi |
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| (noun) (West Indies) followers of a religious system involving witchcraft and sorcery | Synonyms: obi |
| obeche | (noun) large west African tree having large palmately lobed leaves and axillary cymose panicles of small white flowers and one-winged seeds; yields soft white to pale yellow wood | Synonyms: arere, obechi, samba, Triplochiton scleroxcylon |
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| (noun) the wood of an African obeche tree; used especially for veneering | - |
| obechi | (noun) large west African tree having large palmately lobed leaves and axillary cymose panicles of small white flowers and one-winged seeds; yields soft white to pale yellow wood | Synonyms: arere, obeche, samba, Triplochiton scleroxcylon |
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| obedience | (noun) the act of obeying; dutiful or submissive behavior with respect to another person | Synonyms: obeisance |
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| (noun) behavior intended to please your parents | Synonyms: respect |
| (noun) the trait of being willing to obey | - |
| obeisance | (noun) the act of obeying; dutiful or submissive behavior with respect to another person | Synonyms: obedience |
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| (noun) bending the head or body or knee as a sign of reverence or submission or shame or greeting | Synonyms: bow, bowing |
| obelion | (noun) the craniometric point on the sagittal suture near the lamboid suture | - |
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| obelisk | (noun) a stone pillar having a rectangular cross section tapering towards a pyramidal top | - |
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| (noun) a character used in printing to indicate a second cross reference or footnote when the asterisk has already been used | Synonyms: dagger |
| obesity | (noun) more than average fatness | Synonyms: corpulency, fleshiness |
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| obfuscation | (noun) the activity of obscuring people's understanding, leaving them baffled or bewildered | Synonyms: mystification |
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| (noun) darkening or obscuring the sight of something | - |
| (noun) confusion resulting from failure to understand | Synonyms: bafflement, befuddlement, bemusement, bewilderment, mystification, puzzlement |
| obi | (noun) a religious belief of African origin involving witchcraft and sorcery; practiced in parts of the West Indies and tropical Americas | Synonyms: obeah |
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| (noun) (West Indies) followers of a religious system involving witchcraft and sorcery | Synonyms: obeah |
| obiism | (noun) belief in a kind of sorcery that originated in Africa and is practiced in the West Indies | - |
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| obit | (noun) a notice of someone's death; usually includes a short biography | Synonyms: necrology, obituary |
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| obituary | (noun) a notice of someone's death; usually includes a short biography | Synonyms: necrology, obit |
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| object | (noun) a tangible and visible entity; an entity that can cast a shadow | Synonyms: physical object |
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| (noun) the goal intended to be attained (and which is believed to be attainable) | Synonyms: aim, objective, target |
| (noun) the focus of cognitions or feelings | - |
| (noun) (computing) a discrete item that provides a description of virtually anything known to a computer | - |
| (noun) (grammar) a constituent that is acted upon | - |
| objectification | (noun) the act of representing an abstraction as a physical thing | - |
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| (noun) a concrete representation of an abstract idea or principle | - |
| objection | (noun) (law) a procedure whereby a party to a suit says that a particular line of questioning or a particular witness or a piece of evidence or other matter is improper and should not be continued and asks the court to rule on its impropriety or illegality | - |
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| (noun) the act of protesting; a public (often organized) manifestation of dissent | Synonyms: dissent, protest |
| (noun) the speech act of objecting | - |
| (noun) the act of expressing earnest opposition or protest | Synonyms: expostulation, remonstrance, remonstration |
| objectionableness | (noun) the quality of being hateful | Synonyms: hatefulness, obnoxiousness |
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| objective | (noun) the lens or system of lenses in a telescope or microscope that is nearest the object being viewed | Synonyms: object glass, object lens, objective lens |
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| (noun) the goal intended to be attained (and which is believed to be attainable) | Synonyms: aim, object, target |
| objectiveness | (noun) judgment based on observable phenomena and uninfluenced by emotions or personal prejudices | Synonyms: objectivity |
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| objectivity | (noun) judgment based on observable phenomena and uninfluenced by emotions or personal prejudices | Synonyms: objectiveness |
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| objectivization | (noun) the act or process of making or becoming objective. | - |
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| objector | (noun) a person who dissents from some established policy | Synonyms: contestant, dissenter, dissident, protester |
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| objurgation | (noun) rebuking a person harshly | Synonyms: chiding, scolding, tongue-lashing |
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| oblate | (noun) a lay person dedicated to religious work or the religious life | - |
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| oblateness | (noun) the property possessed by a round shape that is flattened at the poles | Synonyms: ellipticity |
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| oblation | (noun) the act of contributing to the funds of a church or charity | Synonyms: offering |
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| obligation | (noun) the social force that binds you to the courses of action demanded by that force | Synonyms: duty, responsibility |
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| (noun) a legal agreement specifying a payment or action and the penalty for failure to comply | - |
| (noun) a written promise to repay a debt | Synonyms: certificate of indebtedness, debt instrument |
| (noun) a personal relation in which one is indebted for a service or favor | Synonyms: indebtedness |
| (noun) the state of being obligated to do or pay something | - |
| obligato | (noun) a part of the score that must be performed without change or omission | Synonyms: obbligato |
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| (noun) a persistent but subordinate motif | Synonyms: obbligato |
| obliger | (noun) someone who performs a service or does a favor | Synonyms: accommodator |
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| obligingness | (noun) a disposition or tendency to yield to the will of others | Synonyms: complaisance, compliance, compliancy, deference |
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| oblique | (noun) a diagonally arranged abdominal muscle on either side of the torso | Synonyms: abdominal external oblique muscle, external oblique muscle, musculus obliquus externus abdominis |
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| (noun) any grammatical case other than the nominative | Synonyms: oblique case |
| obliqueness | (noun) the property of being neither parallel nor perpendicular, but at a slanting angle | - |
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| (noun) the quality of being oblique and rambling indirectly | Synonyms: deviousness |
| obliquity | (noun) the quality of being deceptive | Synonyms: deceptiveness |
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| (noun) the presentation during labor of the head of the fetus at an abnormal angle | Synonyms: asynclitism |
| obliteration | (noun) destruction by annihilating something | Synonyms: annihilation |
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| (noun) the complete destruction of every trace of something | Synonyms: eradication |
| obliterator | (noun) an eliminator that does away with all traces | - |
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| oblivion | (noun) total forgetfulness | Synonyms: obliviousness |
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| (noun) the state of being disregarded or forgotten | Synonyms: limbo |
| obliviousness | (noun) total forgetfulness | Synonyms: oblivion |
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| oblong | (noun) a plane figure that deviates from a square or circle due to elongation | - |
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| oblongness | (noun) the property of being shaped like a rectangle | Synonyms: rectangularity |
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| obloquy | (noun) a false accusation of an offense or a malicious misrepresentation of someone's words or actions | Synonyms: calumniation, calumny, defamation, hatchet job, traducement |
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| (noun) state of disgrace resulting from public abuse | Synonyms: opprobrium |
| obnoxiousness | (noun) the quality of being hateful | Synonyms: hatefulness, objectionableness |
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| oboe | (noun) a slender double-reed instrument; a woodwind with a conical bore and a double-reed mouthpiece | Synonyms: hautbois, hautboy |
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| oboist | (noun) a musician who plays the oboe | - |
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| obolus | (noun) a Greek unit of weight equal to one tenth of a gram | - |
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| obscenity | (noun) an obscene act | - |
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| (noun) the trait of behaving in an obscene manner | Synonyms: bawdiness, lewdness, salaciousness, salacity |
| (noun) an offensive or indecent word or phrase | Synonyms: dirty word, filth, smut, vulgarism |
| obscurantism | (noun) a deliberate act intended to make something obscure | - |
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| (noun) a policy of opposition to enlightenment or the spread of knowledge | - |
| obscurantist | (noun) a person who is deliberately vague | - |
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| obscureness | (noun) the quality of being unclear or abstruse and hard to understand | Synonyms: abstruseness, obscurity, reconditeness |
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| (noun) the state of being humble and unimportant | Synonyms: humbleness, lowliness, unimportance |
| (noun) the state of being indistinct or indefinite for lack of adequate illumination | Synonyms: obscurity |
| obscurity | (noun) the quality of being unclear or abstruse and hard to understand | Synonyms: abstruseness, obscureness, reconditeness |
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| (noun) an obscure and unimportant standing; not well known | - |
| (noun) the state of being indistinct or indefinite for lack of adequate illumination | Synonyms: obscureness |
| obsequiousness | (noun) abject or cringing submissiveness | Synonyms: servility, subservience |
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| obsequy | (noun) a ceremony at which a dead person is buried or cremated | Synonyms: funeral |
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| observance | (noun) the act of observing; taking a patient look | Synonyms: observation, watching |
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| (noun) conformity with law or custom or practice etc. | Synonyms: honoring, honouring |
| (noun) the act of noticing or paying attention | Synonyms: notice, observation |
| (noun) a formal event performed on a special occasion | Synonyms: ceremonial, ceremonial occasion, ceremony |
| observation | (noun) the act of observing; taking a patient look | Synonyms: observance, watching |
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| (noun) the act of making and recording a measurement | - |
| (noun) the act of noticing or paying attention | Synonyms: notice, observance |
| (noun) facts learned by observing | - |
| (noun) a remark expressing careful consideration | Synonyms: reflection, reflexion |
| observatory | (noun) a building designed and equipped to observe astronomical phenomena | - |
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| (noun) a structure commanding a wide view of its surroundings | Synonyms: lookout, lookout station, observation tower |
| observer | (noun) a person who becomes aware (of things or events) through the senses | Synonyms: beholder, perceiver, percipient |
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| (noun) an expert who observes and comments on something | Synonyms: commentator |
| obsession | (noun) an unhealthy and compulsive preoccupation with something or someone | Synonyms: fixation |
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| (noun) an irrational motive for performing trivial or repetitive actions, even against your will | Synonyms: compulsion |
| obsessive | (noun) a person who has obsessions | - |
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| obsessiveness | (noun) extreme compulsiveness | Synonyms: obsessivity |
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| obsessivity | (noun) extreme compulsiveness | Synonyms: obsessiveness |
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| obsidian | (noun) acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces | - |
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| obsolescence | (noun) the process of becoming obsolete; falling into disuse or becoming out of date | - |
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| obsoleteness | (noun) the property of being out of date and not current | Synonyms: superannuation |
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| obstacle | (noun) an obstruction that stands in the way (and must be removed or surmounted or circumvented) | - |
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| (noun) something immaterial that stands in the way and must be circumvented or surmounted | Synonyms: obstruction |
| obstetrician | (noun) a physician specializing in obstetrics | Synonyms: accoucheur |
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| obstetrics | (noun) the branch of medicine dealing with childbirth and care of the mother | Synonyms: midwifery, OB, tocology |
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| obstinacy | (noun) the trait of being difficult to handle or overcome | Synonyms: mulishness, obstinance, stubbornness |
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| (noun) resolute adherence to your own ideas or desires | Synonyms: bullheadedness, obstinance, pigheadedness, self-will, stubbornness |
| obstinance | (noun) the trait of being difficult to handle or overcome | Synonyms: mulishness, obstinacy, stubbornness |
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| (noun) resolute adherence to your own ideas or desires | Synonyms: bullheadedness, obstinacy, pigheadedness, self-will, stubbornness |
| obstipation | (noun) severe constipation resulting from an obstruction in the intestines | - |
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