| bicuspid | (adjective) having two cusps or points (especially a molar tooth) | Synonyms: bicuspidate |
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| hispid | (adjective) (of animals or plants) having stiff coarse hairs or bristles | - |
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| insipid | (adjective) lacking taste or flavor or tang | Synonyms: bland, flat, flavorless, flavourless, savorless, savourless, vapid |
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| (adjective) lacking interest or significance or impact | Synonyms: jejune |
| intrepid | (adjective) invulnerable to fear or intimidation | Synonyms: audacious, brave, dauntless, fearless, hardy, unfearing |
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| limpid | (adjective) (of language) transparently clear; easily understandable | Synonyms: crystal clear, lucid, luculent, pellucid, perspicuous |
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| (adjective) transmitting light; able to be seen through with clarity | Synonyms: crystal clear, crystalline, lucid, pellucid, transparent |
| (adjective) clear and bright | Synonyms: liquid |
| rapid | (adjective) done or occurring in a brief period of time | - |
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| (adjective) characterized by speed; moving with or capable of moving with high speed | Synonyms: speedy |
| sapid | (adjective) full of flavor | Synonyms: flavorful, flavorous, flavorsome, flavourful, flavourous, flavoursome, saporous |
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| stupid | (adjective) lacking or marked by lack of intellectual acuity | - |
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| (adjective) lacking intelligence | Synonyms: unintelligent |
| (adjective) in a state of mental numbness especially as resulting from shock | Synonyms: dazed, stunned, stupefied |
| tepid | (adjective) feeling or showing little interest or enthusiasm | Synonyms: half-hearted, halfhearted, lukewarm |
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| (adjective) moderately warm | Synonyms: lukewarm |
| torpid | (adjective) in a condition of biological rest or suspended animation | Synonyms: dormant, hibernating |
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| (adjective) slow and apathetic | Synonyms: inert, sluggish, soggy |
| trepid | (adjective) timid by nature or revealing timidity | Synonyms: fearful, timorous |
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| tricuspid | (adjective) having three cusps or points (especially a molar tooth) | Synonyms: tricuspidate |
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| unicuspid | (adjective) having a single cusp or point | - |
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| vapid | (adjective) lacking taste or flavor or tang | Synonyms: bland, flat, flavorless, flavourless, insipid, savorless, savourless |
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| (adjective) lacking significance or liveliness or spirit or zest | - |