without breath or breathing with difficulty; gasping; panting

We were breathless after the steep climb.

with the breath held, as in suspense, astonishment, fear, or the like

breathless listeners of the mystery story.

causing loss of breath, as from excitement, anticipation, or tension

a breathless ride.

dead; lifeless.

motionless or still, as air without a breeze

a breathless summer day.

adjective

breathy , calm

adjective

asthmatic , blown , choking , emphysematous , exhausted , gasping , gulping , out of breath , panting , short of breath , short-winded , spent , stertorous , wheezing , winded , agog , anxious , avid , eager , excited , flabbergasted , open-mouthed , thunderstruck , with bated breath , breezeless , still , windless , agasp , airless , astounded , dead , keen , stale , tense