| watchful | (adjective) engaged in or accustomed to close observation | Synonyms: alert |
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| (adjective) experiencing or accompanied by sleeplessness | Synonyms: insomniac, sleepless |
| (adjective) carefully observant or attentive; on the lookout for possible danger | Synonyms: argus-eyed, open-eyed, vigilant, wakeful |
| waterborne | (adjective) supported by water | - |
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| (adjective) transported by water | - |
| watercress | (adjective) of a moderate yellow-green color that is greener and deeper than moss green and yellower and darker than pea green | Synonyms: cress green, cresson |
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| watered | (adjective) (of silk fabric) having a wavelike pattern | Synonyms: moire |
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| waterless | (adjective) lacking sufficient water or rainfall | Synonyms: arid |
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| waterlogged | (adjective) (of soil) soft and watery | Synonyms: boggy, marshy, miry, mucky, muddy, quaggy, sloppy, sloughy, soggy, squashy, swampy |
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| waterproof | (adjective) not permitting the passage of water | Synonyms: rainproof, waterproofed |
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| waterproofed | (adjective) not permitting the passage of water | Synonyms: rainproof, waterproof |
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| watertight | (adjective) without flaws or loopholes | Synonyms: bulletproof, ironclad, unassailable, unshakable |
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| (adjective) not allowing water to pass in or out | - |
| waterworn | (adjective) (of rocks especially) worn smooth by the action of water | - |
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| watery | (adjective) overly diluted; thin and insipid | Synonyms: washy, weak |
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| (adjective) relating to or resembling or consisting of water | - |
| (adjective) wet with secreted or exuded moisture such as sweat or tears | Synonyms: reeking |
| (adjective) filled with water | - |