adequate vs passable

adequate and passable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
adequate	No	Yes	No	No
passable	No	Yes	No	No

As adjectives, adequate and passable are synonyms defined as:

Other synonyms of adequate include fair to middling, tolerable.

adequate (adjective)	passable (adjective)
having the requisite qualities or resources to meet a task	able to be passed or traversed or crossed
about average; acceptable	about average; acceptable
sufficient for the purpose