Etymology
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breathless (adj.)

late 14c., "unable to breathe," from breath + -less. Meaning "out of breath, panting" is from mid-15c. Also used from 1590s in the sense "dead." Meaning "forgetting to breathe" due to excitement, awe, anticipation, etc. is recorded from 1765. Related: Breathlessly; breathlessness. Breathful was used late 16c.

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Definitions of breathless

breathless (adj.)
not breathing or able to breathe except with difficulty;
followed the match with breathless interest
breathless from running
breathless at thought of what I had done
Synonyms: dyspneic / dyspnoeic / dyspneal / dyspnoeal
breathless (adj.)
tending to cause suspension of regular breathing;
a breathless flight
Synonyms: breathtaking
breathless (adj.)
appearing dead; not breathing or having no perceptible pulse;
Synonyms: inanimate / pulseless
From wordnet.princeton.edu