1. breathless (vs. breathing), dyspneic, dyspnoeic, dyspneal, dyspnoeal, asphyxiating, smothering, suffocating, suffocative, blown, pursy, short-winded, winded, unventilated

usage: 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"

2. breathless, breathtaking, exciting (vs. unexciting)

usage: tending to cause suspension of regular breathing; "a breathless flight"; "breathtaking adventure"

3. breathless, inanimate, pulseless, dead (vs. alive)

usage: appearing dead; not breathing or having no perceptible pulse; "an inanimate body"; "pulseless and dead"

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See also: breathless (Dictionary)