| unsuasible | (adjective) not susceptible to persuasion | Synonyms: unpersuadable |
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| unsubdivided | (adjective) (botany) of leaf shapes; of leaves having no divisions or subdivisions | Synonyms: simple |
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| unsubduable | (adjective) impossible to subdue | Synonyms: indomitable, never-say-die |
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| unsubdued | (adjective) not brought under control | - |
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| unsubmissive | (adjective) not servile or submissive | Synonyms: unservile |
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| unsubstantial | (adjective) lacking material form or substance; unreal | Synonyms: insubstantial, unreal |
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| unsubstantiated | (adjective) unsupported by other evidence | Synonyms: uncorroborated |
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| unsubtle | (adjective) lacking subtlety; obvious | Synonyms: broad |
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| unsuccessful | (adjective) not successful; having failed or having an unfavorable outcome | - |
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| (adjective) failing to accomplish an intended result | Synonyms: abortive, stillborn |
| unsufferable | (adjective) too extreme to bear | Synonyms: insufferable |
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| unsugared | (adjective) with no sugar added | - |
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| unsuitable | (adjective) not conducive to good moral development | - |
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| (adjective) not worthy of being chosen (especially as a spouse) | Synonyms: undesirable |
| (adjective) not meant or adapted for a particular purpose | - |
| (adjective) not capable of being applied | Synonyms: inapplicable |
| unsuited | (adjective) not easy to combine harmoniously | Synonyms: ill-sorted, incompatible, mismated |
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| unsullied | (adjective) spotlessly clean and fresh | - |
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| (adjective) (of reputation) free from blemishes | Synonyms: stainless, unstained, untainted, untarnished |
| unsung | (adjective) not famous or acclaimed | Synonyms: obscure, unknown |
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| (adjective) having value that is not acknowledged | Synonyms: unappreciated, unvalued |
| unsupervised | (adjective) not supervised or under constant observation | - |
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| unsupportable | (adjective) not able to be supported or defended | - |
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| unsupported | (adjective) not held up or borne | - |
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| (adjective) not sustained or maintained by nonmaterial aid | - |
| unsupportive | (adjective) not furnishing support or assistance | - |
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| unsuppressed | (adjective) given vent to | - |
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| unsure | (adjective) lacking or indicating lack of confidence or assurance | Synonyms: incertain, uncertain |
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| (adjective) lacking self-confidence | Synonyms: diffident, shy, timid |
| unsurmountable | (adjective) not capable of being surmounted or overcome | Synonyms: insurmountable |
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| (adjective) incapable of being surmounted or climbed | Synonyms: unclimbable |
| unsurpassable | (adjective) not to be exceeded | - |
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| unsurpassed | (adjective) not capable of being improved on | Synonyms: unexceeded, unexcelled |
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| unsurprised | (adjective) not surprised or expressing surprise | Synonyms: not surprised |
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| unsurprising | (adjective) not causing surprise | - |
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| unsusceptible | (adjective) not susceptible to | Synonyms: insusceptible |
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| unsuspected | (adjective) not suspected or believed likely | - |
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| unsuspecting | (adjective) not suspicious | Synonyms: unsuspicious |
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| (adjective) (often followed by `of') not knowing or expecting; not thinking likely | - |
| unsuspicious | (adjective) not suspicious | Synonyms: unsuspecting |
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