| enervated | (adjective) lacking energy or vitality | Synonyms: adynamic, asthenic, debilitated |
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| enervating | (adjective) causing debilitation | Synonyms: debilitative, enfeebling, weakening |
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| nerveless | (adjective) marked by calm self-control (especially in trying circumstances); unemotional | Synonyms: cool, coolheaded |
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| (adjective) lacking strength | Synonyms: feeble |
| nervous | (adjective) of or relating to the nervous system | Synonyms: neural |
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| (adjective) unpredictably excitable (especially of horses) | Synonyms: flighty, skittish, spooky |
| (adjective) excited in anticipation | Synonyms: aflutter |
| (adjective) easily agitated | - |
| (adjective) causing or fraught with or showing anxiety | Synonyms: anxious, queasy, uneasy, unquiet |
| nervy | (adjective) showing or requiring courage and contempt of danger | - |
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| (adjective) offensively bold | Synonyms: brash, cheeky |
| (adjective) being in a tense state | Synonyms: edgy, high-strung, highly strung, jittery, jumpy, overstrung, restive, uptight |
| unnerved | (adjective) deprived of courage and strength | - |
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| unnerving | (adjective) inspiring fear | Synonyms: formidable, redoubtable |
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