| old | (adjective) of long duration; not new | - |
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| (adjective) (used especially of persons) having lived for a relatively long time or attained a specific age | - |
| (adjective) skilled through long experience | Synonyms: older |
| (adjective) (used for emphasis) very familiar | - |
| (adjective) excellent | Synonyms: bang-up, bully, corking, cracking, dandy, great, groovy, keen, neat, nifty, not bad, peachy, slap-up, smashing, swell |
| (adjective) just preceding something else in time or order | Synonyms: previous |
| (adjective) belonging to some prior time | Synonyms: erstwhile, former, one-time, onetime, quondam, sometime |
| olden | (adjective) relating to time long past | - |
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| older | (adjective) skilled through long experience | Synonyms: old |
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| (adjective) advanced in years; (`aged' is pronounced as two syllables) | Synonyms: aged, elderly, senior |
| (adjective) used of the older of two persons of the same name especially used to distinguish a father from his son | Synonyms: elder, sr. |
| oldish | (adjective) somewhat elderly | - |
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| oldline | (adjective) long-established | Synonyms: old-line |
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| (adjective) adhering to conservative or reactionary principles | Synonyms: old-line |
| oleaceous | (adjective) of or pertaining to or characteristic of trees or shrubs of the olive family | - |
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| oleaginous | (adjective) containing an unusual amount of grease or oil | Synonyms: greasy, oily, sebaceous |
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| (adjective) unpleasantly and excessively suave or ingratiating in manner or speech | Synonyms: buttery, fulsome, oily, smarmy, soapy, unctuous |
| oleophilic | (adjective) having a strong affinity for oils rather than water | - |
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| oleophobic | (adjective) lacking affinity for oils | - |
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| olfactive | (adjective) of or relating to olfaction | Synonyms: olfactory |
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| olfactory | (adjective) of or relating to olfaction | Synonyms: olfactive |
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| oligarchic | (adjective) of or relating to or supporting or characteristic of an oligarchy | Synonyms: oligarchical |
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| oligarchical | (adjective) of or relating to or supporting or characteristic of an oligarchy | Synonyms: oligarchic |
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| olive | (adjective) of a yellow-green color similar to that of an unripe olive | - |
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| olivelike | (adjective) resembling an olive | Synonyms: olive-like |
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| olympian | (adjective) far beyond what is usual in magnitude or degree | Synonyms: exceeding, exceptional, prodigious, surpassing |
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| (adjective) majestic in manner or bearing; superior to mundane matters | Synonyms: majestic |