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Definition of unfasten

unfasten

/ʌnˈfæs.ən/
un · fas · ten
Adjective:unfastened
•
Past Simple:unfastened
•
Past Participle:unfastened
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Present Participle:unfastening
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unfasten Lexical Profile

unfasten Game Scores & Validity

• verb

1

To open, undo, or release something that is secured with a clasp, buckle, button, or latch, or to become undone in this way.

Example

"Passengers may unfasten their seatbelts once the aircraft has reached a safe cruising altitude."

Synonyms
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Antonyms
View all antonyms for unfasten

• Rhymes for unfasten

• Nearby Words

unfancy
unfashionable
unfashionably
unfasten
unfatherly
unfathomable
unfathomably

Word Origin & Etymology

Formed in Old English as unfaestnian, combining the reversative prefix un- with faestnian ('to make firm or secure'), from the Germanic root fast.

Cite this Entry

Wordmom. (2026). Definition of Unfasten. In Wordmom Dictionary. Retrieved Nov 3, 2026, from https://wordmom.com/dictionary/unfasten
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