foiled vs frustrated

foiled and frustrated both are adjectives.

Word	Noun	Adjective	Verb	Adverb
foiled	No	Yes	No	No
frustrated	No	Yes	No	No

As adjectives, foiled and frustrated are synonyms defined as:

Other synonyms of foiled include defeated, disappointed, discomfited, thwarted.

foiled (adjective)	frustrated (adjective)
disappointingly unsuccessful	disappointingly unsuccessful