dyspneal vs breathless

dyspneal and breathless both are adjectives.

Word	Noun	Adjective	Verb	Adverb
dyspneal	No	Yes	No	No
breathless	No	Yes	No	No

As adjectives, dyspneal and breathless are synonyms defined as:

dyspneal and breathless: not breathing or able to breathe except with difficulty

Other synonyms of dyspneal include dyspneic, dyspnoeal, dyspnoeic.

dyspneal (adjective)	breathless (adjective)
not breathing or able to breathe except with difficulty	not breathing or able to breathe except with difficulty
	appearing dead; not breathing or having no perceptible pulse
	tending to cause suspension of regular breathing