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unfastened

adjective

• open
• unbuttoned
• untied

antonyms

• buttoned
• fastened
• shut
• tied

related terms

• open

similar terms

• ajar
• open-collared
• unbarred
• unbolted
• undone
• unlatched
• unlocked
• unsecured
• wide-open

sounds kind of like

• unaffectionate