This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Breathing with difficulty; gasping: was breathless from running.

adj. Marked by the suspension of regular breathing, as from tension or excitement: a breathless audience.

adj. Causing or capable of causing the suspension of regular breathing; tense or exciting: a breathless flight.

adj. Not breathing; without breath.

adj. Dead.

adj. Having no air or breeze; still: a breathless summer day.

adj. Having difficulty breathing; gasping.

adj. That makes one hold one's breath (with excitement etc.).

adj. Not breathing; apparently dead.

adj. Having no wind; still, calm or airless.

adj. Spent with labor or violent action; out of breath.

adj. Not breathing; holding the breath, on account of fear, expectation, or intense interest; attended with a holding of the breath.

adj. Dead.

Without breath; dead.

Out of breath; spent with labor or exertion.

That takes away the breath.

Marked by an apparent forgetfulness to breathe; absorbed; eager; excited.

adj. tending to cause suspension of regular breathing

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

adj. not breathing or able to breathe except with difficulty

"The air was in breathless calm, not a needle quivered, and the least sounds of the camp were distinct and clear as trumpet calls."

exciting    dead    asphyxiating    winded    short-winded    suffocating    pursy    blown    suffocative    smothering   

lifeless   

breathlessly    breathlessness   

dead   

frantic    speechless    hoarse    desperate    feverish    daze    nervous    tremulous    helpless    tense