fastened vs buttoned

fastened and buttoned both are adjectives.

Word	Noun	Adjective	Verb	Adverb
fastened	No	Yes	No	No
buttoned	No	Yes	No	No

As adjectives, fastened and buttoned are synonyms defined as:

fastened and buttoned: furnished or closed with buttons or something buttonlike

fastened (adjective)	buttoned (adjective)
firmly closed or secured	furnished or closed with buttons or something buttonlike
furnished or closed with buttons or something buttonlike
fastened with strings or cords