| obscure | (verb) make unintelligible or unclear | Synonyms: bedim, overcloud |
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| (verb) make undecipherable or imperceptible by obscuring or concealing | Synonyms: blot out, hide, obliterate, veil |
| (verb) reduce a vowel to a neutral one, such as a schwa | - |
| (verb) make unclear, indistinct, or blurred | Synonyms: blur, confuse, obnubilate |
| (verb) make less visible or unclear | Synonyms: becloud, befog, cloud, fog, haze over, mist, obnubilate |
| 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 |
| obsess | (verb) haunt like a ghost; pursue | Synonyms: ghost, haunt |
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| (verb) be preoccupied with something | - |
| obsolesce | (verb) become obsolete, fall into disuse | - |
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| obstinate | (verb) persist stubbornly | - |
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| obstipate | (verb) constipate severely | - |
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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 |