| ominous | (adjective) threatening or foreshadowing evil or tragic developments | Synonyms: baleful, forbidding, menacing, minacious, minatory, sinister, threatening |
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| (adjective) presaging ill fortune | Synonyms: ill, inauspicious |
| omissible | (adjective) capable of being left out | - |
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| omissive | (adjective) characterized by omissions | - |
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| omnibus | (adjective) providing for many things at once | - |
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| omnidirectional | (adjective) not directional | - |
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| omnifarious | (adjective) of all varieties or forms or kinds | - |
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| omnipotent | (adjective) having unlimited power | Synonyms: all-powerful, almighty |
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| omnipresent | (adjective) being present everywhere at once | Synonyms: ubiquitous |
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| omniscient | (adjective) infinitely wise | Synonyms: all-knowing |
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| omnivorous | (adjective) feeding on both plants and animals | - |
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