"nerviest" in the adjective sense
1. edgy, high-strung, highly strung, jittery, jumpy, nervy, overstrung, restive, uptight
being in a tense state
showing or requiring courage and contempt of danger
"the nervy feats of mountaineers"
3. brash, cheeky, nervy
"a brash newcomer disputed the age-old rules for admission to the club"
"a nervy thing to say"
Source: WordNet® (An amazing lexical database of English)
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