| 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 |
| observing | (adjective) quick to notice; showing quick and keen perception | Synonyms: observant |
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| observingly | (adverb) in an observant manner | Synonyms: observantly |
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| obsess | (verb) haunt like a ghost; pursue | Synonyms: ghost, haunt |
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| (verb) be preoccupied with something | - |
| obsessed | (adjective) having or showing excessive or compulsive concern with something | Synonyms: haunted, preoccupied, taken up |
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| (adjective) influenced or controlled by a powerful force such as a strong emotion | Synonyms: possessed |
| 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 |
| obsessional | (adjective) characterized by or constituting an obsession | Synonyms: obsessive |
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| obsessionally | (adverb) in a compulsive manner | Synonyms: compulsively, obsessively |
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| obsessive | (adjective) characterized by or constituting an obsession | Synonyms: obsessional |
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| (noun) a person who has obsessions | - |
| obsessively | (adverb) in a compulsive manner | Synonyms: compulsively, obsessionally |
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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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| obsolesce | (verb) become obsolete, fall into disuse | - |
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| obsolescence | (noun) the process of becoming obsolete; falling into disuse or becoming out of date | - |
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| obsolescent | (adjective) becoming obsolete | - |
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| obsolete | (adjective) no longer in use | Synonyms: disused |
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| (adjective) old; no longer valid or fashionable | Synonyms: out-of-date, outdated, superannuated |
| 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 |
| obstetric | (adjective) of or relating to or used in or practicing obstetrics | Synonyms: obstetrical |
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| obstetrical | (adjective) of or relating to or used in or practicing obstetrics | Synonyms: obstetric |
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| 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 |
| obstinate | (adjective) tenaciously unwilling or marked by tenacious unwillingness to yield | Synonyms: stubborn, unregenerate |
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| (adjective) resistant to guidance or discipline | Synonyms: contrary, perverse, wayward |
| (adjective) stubbornly persistent in wrongdoing | Synonyms: cussed, obdurate, unrepentant |
| (verb) persist stubbornly | - |
| obstinately | (adverb) in a stubborn unregenerate manner | Synonyms: cussedly, mulishly, obdurately, pig-headedly, stubbornly |
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| obstipate | (verb) constipate severely | - |
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| obstipation | (noun) severe constipation resulting from an obstruction in the intestines | - |
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| obstreperous | (adjective) boisterously and noisily aggressive | - |
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| (adjective) noisily and stubbornly defiant | - |
| obstreperously | (adverb) in manner that attracts attention | Synonyms: clamorously, loudly |
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| obstreperousness | (noun) noisy defiance | - |
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| obstruct | (verb) block passage through | Synonyms: block, close up, impede, jam, obturate, occlude |
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| (verb) shut out from view or get in the way so as to hide from sight | Synonyms: block |
| (verb) hinder or prevent the progress or accomplishment of | Synonyms: block, blockade, embarrass, hinder, stymie, stymy |
| obstructed | (adjective) shut off to passage or view or hindered from action | - |
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| obstructer | (noun) any structure that makes progress difficult | Synonyms: impediment, impedimenta, obstruction, obstructor |
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| (noun) someone who systematically obstructs some action that others want to take | Synonyms: obstructionist, obstructor, resister, thwarter |
| obstruction | (noun) getting in someone's way | - |
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| (noun) the act of obstructing | - |
| (noun) any structure that makes progress difficult | Synonyms: impediment, impedimenta, obstructer, obstructor |
| (noun) something immaterial that stands in the way and must be circumvented or surmounted | Synonyms: obstacle |
| (noun) the physical condition of blocking or filling a passage with an obstruction | Synonyms: blockage |
| obstructionism | (noun) deliberate interference | - |
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| obstructionist | (noun) someone who systematically obstructs some action that others want to take | Synonyms: obstructer, obstructor, resister, thwarter |
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| obstructive | (adjective) preventing movement | Synonyms: clogging, hindering, impeding |
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| obstructively | (adverb) in an obstructive manner | Synonyms: hinderingly |
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| obstructor | (noun) any structure that makes progress difficult | Synonyms: impediment, impedimenta, obstructer, obstruction |
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| (noun) someone who systematically obstructs some action that others want to take | Synonyms: obstructer, obstructionist, resister, thwarter |
| obstruent | (noun) a consonant that is produced with a partial or complete blockage of the airflow from the lungs through the nose or mouth | - |
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| obtain | (verb) receive a specified treatment (abstract) | Synonyms: find, get, incur, receive |
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| (verb) come into possession of | - |
| (verb) be valid, applicable, or true | Synonyms: hold, prevail |
| obtainable | (adjective) capable of being obtained | Synonyms: getable, gettable, procurable |
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| obtainment | (noun) the act of obtaining | Synonyms: obtention |
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| obtention | (noun) the act of obtaining | Synonyms: obtainment |
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| obtrude | (verb) thrust oneself in as if by force | Synonyms: intrude |
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| (verb) push to thrust outward | Synonyms: push out, thrust out |
| obtrusive | (adjective) undesirably noticeable | - |
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| (adjective) sticking out; protruding | - |
| obtrusively | (adverb) in an obtrusive manner | - |
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| obtrusiveness | (noun) an unwelcome conspicuousness | - |
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| obtund | (verb) reduce the edge or violence of | - |
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| obturate | (verb) block passage through | Synonyms: block, close up, impede, jam, obstruct, occlude |
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| obturator | (noun) a prosthesis used to close an opening (as to close an opening of the hard palate in cases of cleft palate) | - |
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| obtuse | (adjective) of an angle; between 90 and 180 degrees | - |
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| (adjective) (of a leaf shape) rounded at the apex | - |
| (adjective) slow to learn or understand; lacking intellectual acuity | Synonyms: dense, dim, dull, dumb, slow |
| (adjective) lacking in insight or discernment | Synonyms: purblind |
| obtusely | (adverb) stupidly or insensitively | Synonyms: densely, dumbly |
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| obtuseness | (noun) the quality of lacking a sharp edge or point | - |
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| (noun) the quality of being slow to understand | Synonyms: dullness |
| obverse | (noun) the side of a coin or medal bearing the principal stamp or design | - |
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| (noun) the more conspicuous of two alternatives or cases or sides | - |
| obviate | (verb) prevent the occurrence of; prevent from happening; to protect from or to keep away anything undesirable; to ward off | Synonyms: avert, avoid, debar, deflect, fend off, forefend, forfend, head off, stave off, ward off |
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| (verb) get rid of something | Synonyms: eliminate, rid of |
| obviating | (adjective) made impossible | Synonyms: preclusive |
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| obviation | (noun) the act of preventing something by anticipating and disposing of it effectively | Synonyms: forestalling, preclusion |
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| obvious | (adjective) easily perceived and understood | - |
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| obviously | (adverb) unmistakably (`plain' is often used informally for `plainly') | Synonyms: apparently, evidently, manifestly, patently, plain, plainly |
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| obviousness | (noun) the property of being easy to see and understand | Synonyms: noticeability, noticeableness, patency |
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