| 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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| obstreperousness | (noun) noisy defiance | - |
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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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| 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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