"unbuttoned" in the verb sense
1. unbutton
undo the buttons of
"unbutton the shirt"
"unbuttoned" in the adjective sense
1. unbuttoned, unfastened
not buttoned
"the wind picked up the hem of her unbuttoned coat"
2. unbuttoned, unlaced
not under constraint in action or expression
"this unbuttoned and disrespectful age"- Curtis Bok
"unlaced behavior in the neighborhood pub"
Source: WordNet® (An amazing lexical database of English)
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