| unhealthfulness | (noun) the quality of promoting poor health | - |
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| unhealthiness | (noun) a state in which you are unable to function normally and without pain | Synonyms: health problem, ill health |
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| unhealthy | (adjective) not in or exhibiting good health in body or mind | - |
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| (adjective) not conducive to good health | - |
| (adjective) detrimental to health | Synonyms: insalubrious, unhealthful |
| unhearable | (adjective) impossible to hear; imperceptible by the ear | Synonyms: inaudible |
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| unheard | (adjective) not necessarily inaudible but not heard | - |
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| unhearing | (adjective) totally deaf; unable to hear anything | Synonyms: deaf as a post, profoundly deaf, stone-deaf |
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| unheated | (adjective) not having been heated or warmed | Synonyms: unwarmed |
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| unrehearsed | (adjective) with little or no preparation or forethought | Synonyms: ad-lib, extemporaneous, extemporary, extempore, impromptu, off-the-cuff, offhand, offhanded |
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| unsheared | (adjective) not sheared | Synonyms: unshorn |
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| (adjective) (used especially of fur or wool) not having been sheared | - |
| unsheathe | (verb) draw from a sheath or scabbard | - |
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| unsheathed | (adjective) not having a protective covering | Synonyms: bare |
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| untheatrical | (adjective) not suited to or characteristic of the stage or theater | - |
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| upheaval | (noun) disturbance usually in protest | Synonyms: agitation, excitement, hullabaloo, turmoil |
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| (noun) (geology) a rise of land to a higher elevation (as in the process of mountain building) | Synonyms: uplift, upthrow, upthrust |
| (noun) a state of violent disturbance and disorder (as in politics or social conditions generally) | Synonyms: Sturm und Drang, turbulence |
| (noun) a violent disturbance | Synonyms: convulsion, turmoil |
| upheave | (verb) lift forcefully from beneath | - |
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| warhead | (noun) the front part of a guided missile or rocket or torpedo that carries the nuclear or explosive charge or the chemical or biological agents | Synonyms: load, payload |
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| warmhearted | (adjective) marked by warmth of feeling like kindness and sympathy and generosity | - |
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| warmheartedness | (noun) a positive feeling of liking | Synonyms: affection, affectionateness, fondness, heart, philia, tenderness, warmness |
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| (noun) a warmhearted feeling | Synonyms: warmth |
| wellhead | (noun) a structure built over a well | - |
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| (noun) the source of water for a well | Synonyms: wellspring |
| wheal | (noun) a raised mark on the skin (as produced by the blow of a whip); characteristic of many allergic reactions | Synonyms: wale, weal, welt |
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| wheat | (noun) a variable yellow tint; dull yellow, often diluted with white | Synonyms: pale yellow, straw |
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| (noun) grains of common wheat; sometimes cooked whole or cracked as cereal; usually ground into flour | Synonyms: wheat berry |
| (noun) annual or biennial grass having erect flower spikes and light brown grains | - |
| wheatear | (noun) small songbird of northern America and Eurasia having a distinctive white rump | - |
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| wheaten | (adjective) of or relating to or derived from wheat | Synonyms: whole-wheat, wholemeal |
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| wheatfield | (noun) a field planted with wheat | Synonyms: wheat field |
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| wheatflake | (noun) crisp flake made from wheat | - |
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| wheatgrass | (noun) a grass of the genus Agropyron | Synonyms: wheat-grass |
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| wheatworm | (noun) small roundworm parasitic on wheat | Synonyms: Tylenchus tritici, wheat eel, wheat eelworm |
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| whitehead | (noun) a small whitish lump in the skin due to a clogged sebaceous gland | Synonyms: milium |
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| wholehearted | (adjective) with unconditional and enthusiastic devotion | Synonyms: heart-whole, whole-souled |
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| wholeheartedly | (adverb) without reserve; without reservation | - |
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| wholeheartedness | (noun) the quality of hearty sincerity | Synonyms: heartiness |
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| (noun) undivided commitment or unreserved enthusiasm | - |
| windcheater | (noun) a kind of heavy jacket | Synonyms: anorak, parka, windbreaker |
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| wrongheaded | (adjective) obstinately perverse in judgment or opinion | - |
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| wrongheadedly | (adverb) in a wrongheaded manner | - |
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