| sunless | (adjective) filled or abounding with clouds | Synonyms: cloud-covered, clouded, overcast |
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| sunlit | (adjective) lighted by sunlight | Synonyms: sunstruck |
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| sunny | (adjective) bright and pleasant; promoting a feeling of cheer | Synonyms: cheery, gay |
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| sunrise | (adjective) of an industry or technology; new and developing | - |
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| sunset | (adjective) providing for termination | - |
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| (adjective) of a declining industry or technology | - |
| sunstruck | (adjective) lighted by sunlight | Synonyms: sunlit |
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| suntanned | (adjective) (of skin) having a tan color from exposure to the sun | Synonyms: bronzed, tanned |
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| superabundant | (adjective) most excessively abundant | - |
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| superlunar | (adjective) situated beyond the moon or its orbit around the earth | Synonyms: superlunary, translunar, translunary |
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| (adjective) unworldly or ethereal | Synonyms: superlunary, translunar, translunary |
| superlunary | (adjective) situated beyond the moon or its orbit around the earth | Synonyms: superlunar, translunar, translunary |
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| (adjective) unworldly or ethereal | Synonyms: superlunar, translunar, translunary |
| surmountable | (adjective) capable of being surmounted or overcome | - |
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| (adjective) capable of being surmounted | Synonyms: climbable |
| surmounted | (adjective) having something on top | - |
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| surrounded | (adjective) confined on all sides | Synonyms: encircled |
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| surrounding | (adjective) closely encircling | Synonyms: circumferent, encompassing |
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| tantamount | (adjective) being essentially equal to something | Synonyms: equivalent |
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| taunting | (adjective) abusing vocally; expressing contempt or ridicule | Synonyms: derisive, gibelike, jeering, mocking |
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| thundering | (adjective) extraordinarily big or impressive | - |
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| (adjective) sounding like thunder | - |
| thunderous | (adjective) loud enough to cause (temporary) hearing loss | Synonyms: deafening, earsplitting, thundery |
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| (adjective) extremely ominous | - |
| thunderstruck | (adjective) as if struck dumb with astonishment and surprise | Synonyms: dumbfounded, dumbstricken, dumbstruck, dumfounded, flabbergasted, stupefied |
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| thundery | (adjective) loud enough to cause (temporary) hearing loss | Synonyms: deafening, earsplitting, thunderous |
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| (adjective) accompanied with thunder | - |
| transeunt | (adjective) of a mental act; causing effects outside the mind | Synonyms: transient |
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| translunar | (adjective) situated beyond the moon or its orbit around the earth | Synonyms: superlunar, superlunary, translunary |
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| (adjective) unworldly or ethereal | Synonyms: superlunar, superlunary, translunary |
| translunary | (adjective) situated beyond the moon or its orbit around the earth | Synonyms: superlunar, superlunary, translunar |
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| (adjective) unworldly or ethereal | Synonyms: superlunar, superlunary, translunar |
| transmundane | (adjective) existing or extending beyond the physical world | - |
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| triune | (adjective) being three in one; used especially of the Christian Trinity | - |
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| truncate | (adjective) terminating abruptly by having or as if having an end or point cut off | Synonyms: truncated |
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| truncated | (adjective) terminating abruptly by having or as if having an end or point cut off | Synonyms: truncate |
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| (adjective) cut short in duration | Synonyms: abbreviated, shortened |
| tuneful | (adjective) having a musical sound; especially a pleasing tune | Synonyms: melodious |
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| tuneless | (adjective) not having a musical sound or pleasing tune | Synonyms: unmelodious, untuneful |
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| unabashed | (adjective) not embarrassed | Synonyms: unembarrassed |
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| unabated | (adjective) continuing at full strength or intensity | - |
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| unable | (adjective) (usually followed by `to') not having the necessary means or skill or know-how | - |
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| (adjective) lacking in power or forcefulness | Synonyms: ineffective, ineffectual |
| (adjective) (usually followed by `to') lacking necessary physical or mental ability | - |
| unabridged | (adjective) (used of texts) not shortened | - |
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| unabused | (adjective) not physically abused; treated properly | - |
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| unaccented | (adjective) (used of syllables) carrying no stress | Synonyms: atonic |
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| (adjective) (used of vowels or syllables) pronounced with little or no stress | Synonyms: light, weak |
| unacceptable | (adjective) not acceptable; not welcome | - |
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| (adjective) (used of persons or their behavior) not acceptable or reasonable | Synonyms: impossible |
| (adjective) not conforming to standard usage | Synonyms: unaccepted |
| (adjective) not adequate to give satisfaction | - |
| unaccepted | (adjective) not conforming to standard usage | Synonyms: unacceptable |
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| unaccessible | (adjective) capable of being reached only with great difficulty or not at all | Synonyms: inaccessible |
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| unaccommodating | (adjective) not accommodating | Synonyms: unobliging |
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| (adjective) offering no assistance | - |
| unaccompanied | (adjective) being without an escort | - |
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| (adjective) playing or singing without accompaniment | - |
| (adjective) (of a state or an event) taking place without something specified occurring at the same time | - |
| unaccountable | (adjective) not to be accounted for or explained | Synonyms: unexplainable |
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| (adjective) free from control or responsibility | - |
| unaccredited | (adjective) lacking official approval | Synonyms: unlicenced, unlicensed |
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| unaccustomed | (adjective) unusual or unfamiliar | - |
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| unachievable | (adjective) impossible to achieve | Synonyms: unattainable, undoable, unrealizable |
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| unacknowledged | (adjective) not recognized or admitted | - |
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| (adjective) not openly acknowledged | - |
| unacquainted | (adjective) having little or no knowledge of | Synonyms: unacquainted with, unfamiliar with |
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| (adjective) not knowledgeable about something specified | Synonyms: innocent |
| unacquisitive | (adjective) not acquisitive; not interested in acquiring or owning anything | - |
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| unactable | (adjective) not actable | - |
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| unadaptable | (adjective) not adaptable | - |
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| unadapted | (adjective) not having adapted to new conditions | Synonyms: unadjusted |
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| (adjective) not changed in form or character for a purpose | - |
| unaddicted | (adjective) not addicted | - |
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| unaddressed | (adjective) not addressed | - |
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| unadjustable | (adjective) not adjustable | - |
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| unadjusted | (adjective) not altered to fit certain requirements | - |
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| (adjective) not having adapted to new conditions | Synonyms: unadapted |
| unadoptable | (adjective) difficult to place in an adoptive home | - |
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| unadorned | (adjective) not decorated with something to increase its beauty or distinction | Synonyms: undecorated |
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| unadulterated | (adjective) not mixed with impurities | - |
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| (adjective) without qualification; used informally as (often pejorative) intensifiers | Synonyms: arrant, complete, consummate, double-dyed, everlasting, gross, perfect, pure, sodding, staring, stark, thorough, thoroughgoing, utter |
| unadventurous | (adjective) lacking in boldness | - |
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| unadvisable | (adjective) not prudent or wise; not recommended | Synonyms: inadvisable |
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| unadvised | (adjective) without careful prior deliberation or counsel | Synonyms: ill-advised |
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| (adjective) having received no information | - |
| unaerated | (adjective) (used of blood) not supplied with oxygen | Synonyms: unoxygenated |
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| unaesthetic | (adjective) violating aesthetic canons or requirements; deficient in tastefulness or beauty | Synonyms: inaesthetic |
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| unaffected | (adjective) undergoing no change when acted upon | - |
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| (adjective) free of artificiality; sincere and genuine | - |
| (adjective) emotionally unmoved | Synonyms: unmoved, untouched |
| (adjective) unaware of or indifferent to | Synonyms: insensible |
| unaffecting | (adjective) not arousing affect | - |
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| unaffectionate | (adjective) lacking affection or warm feeling | Synonyms: detached, uncaring |
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| unaffiliated | (adjective) not affiliated | - |
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| unaffixed | (adjective) not affixed | Synonyms: loose |
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| unafraid | (adjective) oblivious of dangers or perils or calmly resolute in facing them | Synonyms: fearless |
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| (adjective) free from fear or doubt; easy in mind | Synonyms: secure, untroubled |
| unaged | (adjective) not subjected to an aging process | - |
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| unaggressive | (adjective) not aggressive; not given to fighting or assertiveness | Synonyms: nonaggressive |
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| unagitated | (adjective) not agitated or disturbed emotionally | - |
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| (adjective) not physically disturbed or set in motion | - |
| (adjective) not agitated; without losing self-possession | Synonyms: calm, serene, tranquil |
| unaided | (adjective) carried out without aid or assistance | - |
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| unaired | (adjective) lacking fresh air | Synonyms: airless, close, stuffy |
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| unairworthy | (adjective) not fit to fly | - |
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| unalarming | (adjective) not alarming; assuaging alarm | - |
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| unalert | (adjective) not alert to what is potentially dangerous | Synonyms: unvigilant, unwatchful |
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| unalienable | (adjective) incapable of being repudiated or transferred to another | Synonyms: inalienable |
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| unalike | (adjective) not alike or similar | Synonyms: dissimilar |
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| unalloyed | (adjective) free from admixture | - |
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| unalterable | (adjective) not capable of being changed or altered | Synonyms: inalterable |
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| (adjective) of a sentence; that cannot be changed | - |
| (adjective) remaining the same for indefinitely long times | Synonyms: changeless |
| unaltered | (adjective) remaining in an original state | Synonyms: unchanged |
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| unambiguous | (adjective) having or exhibiting a single clearly defined meaning | - |
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| (adjective) admitting of no doubt or misunderstanding; having only one meaning or interpretation and leading to only one conclusion | Synonyms: unequivocal, univocal |
| unambitious | (adjective) having little desire for success or achievement | Synonyms: ambitionless |
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| unamended | (adjective) (of legislation) not amended | - |
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| unanalyzable | (adjective) representing the furthest possible extent of analysis or division into parts | Synonyms: undecomposable |
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| unanalyzed | (adjective) not analyzed or broken down for detailed examination | - |
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| unangry | (adjective) not angry | - |
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| unanimated | (adjective) not animated or enlivened; dull | - |
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| unanimous | (adjective) in complete agreement | Synonyms: consentaneous, consentient |
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| (adjective) acting together as a single undiversified whole | Synonyms: solid, whole |
| unannealed | (adjective) (of metal or glass) not annealed and consequently easily cracked or fractured | Synonyms: brittle |
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| unannounced | (adjective) without warning or announcement | Synonyms: unheralded, unpredicted |
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| unanswerable | (adjective) impossible to answer | - |
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| unanswered | (adjective) not returned in kind | Synonyms: unreciprocated, unrequited |
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| unanticipated | (adjective) not anticipated | Synonyms: out of the blue, unforeseen, unlooked-for, unseen |
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| unapologetic | (adjective) unwilling to make or express an apology | - |
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| unappareled | (adjective) having removed clothing | Synonyms: unattired, unclad, undressed, ungarbed, ungarmented |
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| unapparent | (adjective) not readily apparent | - |
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| unappealable | (adjective) not subject to appeal | - |
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| unappealing | (adjective) not able to attract favorable attention | - |
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| (adjective) (of characters in literature or drama) tending to evoke antipathetic feelings | Synonyms: unlikable, unlikeable, unsympathetic |
| unappeasable | (adjective) not to be placated or appeased or moved by entreaty | Synonyms: grim, inexorable, relentless, stern, unforgiving, unrelenting |
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