| unsealed | (adjective) not closed or secured with or as if with a seal | - |
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| (adjective) not established or confirmed | Synonyms: uncertain |
| unseamanlike | (adjective) not seamanlike | - |
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| unseamed | (adjective) having no seams | - |
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| (adjective) smooth, especially of skin | Synonyms: seamless, unlined |
| unseasonable | (adjective) not in keeping with (and usually undesirable for) the season | - |
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| (adjective) badly timed | Synonyms: ill-timed, untimely, wrong |
| unseasoned | (adjective) not aged or processed | - |
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| (adjective) not tried or tested by experience | Synonyms: untested, untried, young |
| (adjective) without salt or seasoning | Synonyms: unsalted |
| unseaworthy | (adjective) unfit for a voyage | - |
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| unsectarian | (adjective) not restricted to one sect or school or party | Synonyms: nonsectarian |
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| unsecured | (adjective) without financial security | Synonyms: unguaranteed |
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| (adjective) not firmly fastened or secured | Synonyms: unbarred, unbolted, unlatched, unlocked |
| unseductive | (adjective) not seductive | - |
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| unseeable | (adjective) impossible or nearly impossible to see; imperceptible by the eye | Synonyms: invisible |
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| unseeded | (adjective) not seeded; used of players of lesser skill | - |
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| (adjective) (of a piece of ground) not have a crop sown on it | Synonyms: unsown |
| unseeing | (adjective) lacking sight | Synonyms: eyeless, sightless |
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| (adjective) not consciously observing | Synonyms: unobservant |
| unseemly | (adjective) not in keeping with accepted standards of what is right or proper in polite society | Synonyms: indecent, indecorous, unbecoming, uncomely, untoward |
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| unseen | (adjective) not seen or perceived | - |
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| (adjective) not anticipated | Synonyms: out of the blue, unanticipated, unforeseen, unlooked-for |
| (adjective) unnoticed | Synonyms: unobserved |
| unsegmented | (adjective) having a body that is not divided into segments | Synonyms: nonsegmental |
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| unsegregated | (adjective) rid of segregation; having had segregation ended | Synonyms: desegrated, nonsegregated |
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| unselected | (adjective) not selected | - |
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| unselective | (adjective) not selective or discriminating | - |
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| unselfconscious | (adjective) not self-conscious | - |
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| unselfish | (adjective) disregarding your own advantages and welfare over those of others | - |
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| (adjective) not greedy | - |
| unsensational | (adjective) not of such character as to arouse intense interest, curiosity, or emotional reaction | - |
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| unsent | (adjective) not dispatched or transmitted | - |
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| unsentimental | (adjective) facing facts or difficulties realistically and with determination | Synonyms: tough-minded |
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| unserviceable | (adjective) not ready for service | - |
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| (adjective) not capable of being used | Synonyms: unusable, unuseable |
| unservile | (adjective) not servile or submissive | Synonyms: unsubmissive |
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| unsettled | (adjective) not settled or established | - |
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| (adjective) still in doubt | - |
| (adjective) not yet settled | - |
| (adjective) subject to change | Synonyms: changeable, uncertain |
| unsexed | (adjective) deprived of sexual capacity or sexual attributes | Synonyms: castrated |
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| unsexy | (adjective) not sexually aroused or arousing | - |
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