foiled vs disappointed

foiled and disappointed both are adjectives.

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

As adjectives, foiled and disappointed are synonyms defined as:

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

foiled (adjective)	disappointed (adjective)
disappointingly unsuccessful	disappointingly unsuccessful