Vad Ă€r nervous? Vad Ă€r nervous? Of or relating to the nerves or nervous system: nervous tissue. Stemming from or affecting the nerves or nervous system: a nervous disorder. Easily agitated or distressed; high-strung or jumpy.Marked by or having a feeling of unease or apprehension: nervous moments before takeoff. Vigorous in style or feeling; spirited: "the nervous thrust of a modern creationâ ( Henry A. Kissinger). Archaic Strong; sinewy.