← DefinitionshareGuessunbuttonedverbPast tense of unbutton: to unfasten the buttons of a piece of clothing.adjectiveWith buttons undone; not fastened.SynonymsunfastenverbundoverbopenadjectivelooseadjectivecasualadjectiveAntonymsfastenverbbuttonverbbuttonedadjectivefastenedadjectiveformaladjective