imperturbable vs unflappable

imperturbable and unflappable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
imperturbable	No	Yes	No	No
unflappable	No	Yes	No	No

As adjectives, imperturbable and unflappable are synonyms defined as:

imperturbable and unflappable: not easily perturbed or excited or upset; marked by extreme calm and composure

imperturbable (adjective)	unflappable (adjective)
not easily perturbed or excited or upset; marked by extreme calm and composure	not easily perturbed or excited or upset; marked by extreme calm and composure