| nonobservance | (noun) a lack of conformity with law or custom or practice etc. | - |
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| nonobservant | (adjective) failing or refusing to observe religious customs | - |
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| obsequious | (adjective) attempting to win favor from influential people by flattery | Synonyms: bootlicking, fawning, sycophantic, toadyish |
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| (adjective) attentive in an ingratiating or servile manner | - |
| obsequiously | (adverb) in an obsequious manner | Synonyms: servilely, subserviently |
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| 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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| observable | (adjective) capable of being seen or noticed | Synonyms: discernible, evident |
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| observably | (adverb) in a noticeable manner | Synonyms: noticeably, perceptibly |
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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 |
| observant | (adjective) paying close attention especially to details | - |
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| (adjective) (of individuals) adhering strictly to laws and rules and customs | Synonyms: law-abiding |
| (adjective) quick to notice; showing quick and keen perception | Synonyms: observing |
| observantly | (adverb) in an observant manner | Synonyms: observingly |
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| 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 |
| observational | (adjective) relying on observation or experiment | Synonyms: data-based, experimental |
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| 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 |
| observe | (verb) stick to correctly or closely | Synonyms: keep, maintain |
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| (verb) make mention of | Synonyms: mention, note, remark |
| (verb) watch attentively | - |
| (verb) observe with care or pay close attention to | Synonyms: note, take note |
| (verb) discover or determine the existence, presence, or fact of by perception with the eyes | Synonyms: detect, discover, find, notice |
| (verb) follow with the eyes or the mind | Synonyms: follow, keep an eye on, watch, watch over |
| (verb) show respect towards | Synonyms: abide by, honor, honour, respect |
| (verb) behave as expected during of holidays or rites | Synonyms: celebrate, keep |
| (verb) conform one's action or practice to | Synonyms: keep |
| observed | (adjective) discovered or determined by scientific observation | Synonyms: ascertained, discovered |
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| 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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| unobservable | (adjective) not accessible to direct observation | - |
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| unobservant | (adjective) not consciously observing | Synonyms: unseeing |
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| unobserved | (adjective) unnoticed | Synonyms: unseen |
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