laughable vs mirthful

laughable and mirthful both are adjectives.

Word	Noun	Adjective	Verb	Adverb
laughable	No	Yes	No	No
mirthful	No	Yes	No	No

As adjectives, laughable and mirthful are synonyms defined as:

Other synonyms of laughable include amusing, comic, comical, funny, risible.

laughable (adjective)	mirthful (adjective)
so unreasonable as to invite derision	arousing or provoking laughter
arousing or provoking laughter	full of or showing high-spirited merriment