‖n. [ L., fr. Gr. &unr_;, fr. &unr_; short of breath; pref. dys- ill, hard + &unr_;, &unr_;, breathing, &unr_; to blow, breathe: cf. F. dyspnée. ] (Med.) Difficulty of breathing. [ 1913 Webster ]
(adj) not breathing or able to breathe except with difficulty, Syn. dyspneal, dyspneic, dyspnoeal, dyspnoeic, Ant. breathing, Example:breathless at thought of what I had done; breathless from running; followed the match with breathless interest