| undiscriminating | (adjective) not discriminating | Synonyms: indiscriminating |
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| unexacting | (adjective) not rigorous | - |
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| unexciting | (adjective) not exciting | - |
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| (adjective) not stimulating | Synonyms: unstimulating |
| unfitting | (adjective) not in keeping with what is correct or proper | Synonyms: inappropriate, incompatible, out of keeping |
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| unfluctuating | (adjective) not liable to fluctuate or especially to fall | Synonyms: firm, steady |
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| unhesitating | (adjective) characterized by quickness and firmness | Synonyms: resolute |
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| unilluminating | (adjective) failing to inform or clarify | Synonyms: unenlightening |
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| uninteresting | (adjective) arousing no interest or attention or curiosity or excitement | - |
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| (adjective) characteristic or suggestive of an institution especially in being uniform or dull or unimaginative | Synonyms: institutional |
| uninviting | (adjective) neither attractive nor tempting | - |
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| (adjective) not tempting | Synonyms: untempting |
| unregretting | (adjective) feeling no regret | Synonyms: unregretful |
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| unrelenting | (adjective) never-ceasing | Synonyms: persistent, relentless |
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| (adjective) not to be placated or appeased or moved by entreaty | Synonyms: grim, inexorable, relentless, stern, unappeasable, unforgiving |
| (adjective) punishingly harsh | Synonyms: brutal |
| unremitting | (adjective) uninterrupted in time and indefinitely long continuing | Synonyms: ceaseless, constant, incessant, never-ending, perpetual, unceasing |
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| unresisting | (adjective) offering no resistance, passively accepting of a situation | Synonyms: resistless |
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| unsporting | (adjective) violating accepted standards or rules | Synonyms: cheating, dirty, foul, unsportsmanlike |
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| unstimulating | (adjective) not stimulating | Synonyms: unexciting |
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| unstinting | (adjective) very generous | Synonyms: lavish, munificent, overgenerous, too-generous, unsparing, unstinted |
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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 | - |
| untempting | (adjective) not appealing to the senses | Synonyms: unattractive |
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| (adjective) not tempting | Synonyms: uninviting |
| untrusting | (adjective) openly distrustful and unwilling to confide | Synonyms: leery, mistrustful, suspicious, wary |
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| unwitting | (adjective) not aware or knowing | - |
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| (adjective) unaware because of a lack of relevant information or knowledge | Synonyms: ignorant, unknowing, unknowledgeable |
| (adjective) not done with purpose or intent | Synonyms: unintentional, unplanned |
| upsetting | (adjective) causing an emotional disturbance | Synonyms: disconcerting |
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| vacillating | (adjective) uncertain in purpose or action | Synonyms: vacillant, wavering |
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| validating | (adjective) serving to support or corroborate | Synonyms: collateral, confirmative, confirmatory, confirming, corroborative, corroboratory, substantiating, substantiative, validatory, verificatory, verifying |
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| vaulting | (adjective) revealing excessive self-confidence; reaching for the heights | Synonyms: overreaching |
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| venerating | (adjective) feeling or manifesting veneration | Synonyms: respectful, reverential |
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| waiting | (adjective) being and remaining ready and available for use | Synonyms: ready and waiting |
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| wanting | (adjective) inadequate in amount or degree | Synonyms: deficient, lacking |
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| (adjective) nonexistent | Synonyms: absent, lacking, missing |
| witting | (adjective) aware or knowing | - |
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| (adjective) intentionally conceived | Synonyms: conscious |