disappointed vs foiled

disappointed and foiled both are adjectives.

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

As adjectives, disappointed and foiled are synonyms defined as:

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

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