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

Similar word(s): asphyxiating, smothering, suffocating, suffocative, blown, pursy, winded, unventilated, dyspneal, dyspneic, dyspnoeal, dyspnoeic

2. tending to cause suspension of regular breathing

- a breathless flight

- breathtaking adventure

Similar word(s): exciting, breathtaking

3. appearing dead; not breathing or having no perceptible pulse

Similar word(s): dead, inanimate, pulseless