nerv·ous / ˈnərvəs/ • adj. 1. easily agitated or alarmed; tending to be anxious; highly strung: a sensitive, nervous person | these quick, nervous birds. ∎ anxious or apprehensive: staying in the house on her own made her nervous | I was nervous about my new job. ∎ (of a feeling or reaction) resulting from anxiety or anticipation: nervous energy.2. relating to or affecting the nerves: a nervous disorder.DERIVATIVES: ner·vous·ly adv.ner·vous·ness n.