unbuttoned
adjective
1. not buttoned
- the wind picked up the hem of her unbuttoned coat
Similar word(s): unfastened
2. not under constraint in action or expression
- this unbuttoned and disrespectful age
Similar word(s): unrestrained, unlaced
verb
1. simple past tense and past participle of unbutton
- I unbuttoned my shirt to take it off.