Wordnet 3.0
ADJECTIVE (1)
1. 
 not breathing or able to breathe except with difficulty; 
- Example: "breathless at thought of what I had done"- Example: "breathless from running"- Example: "followed the match with breathless interest"[syn: breathless, dyspneic, dyspnoeic, dyspneal, dyspnoeal]
WordNet (r) 3.0 (2006):
dyspneal
    adj 1: not breathing or able to breathe except with difficulty;
           "breathless at thought of what I had done"; "breathless
           from running"; "followed the match with breathless
           interest" [syn: breathless, dyspneic, dyspnoeic,
           dyspneal, dyspnoeal] [ant: breathing, eupneic,
           eupnoeic]