unperturbed vs unflustered

unperturbed and unflustered both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unperturbed	No	Yes	No	No
unflustered	No	Yes	No	No

As adjectives, unperturbed and unflustered are synonyms defined as:

unperturbed and unflustered: free from emotional agitation or nervous tension

Other synonyms of unperturbed include unflurried, unruffled.

unperturbed (adjective)	unflustered (adjective)
free from emotional agitation or nervous tension	free from emotional agitation or nervous tension