adjective. not closed or secured.
adjective. affording unobstructed entrance and exit; not shut or closed.
adjective. not tied.
adjective. not buttoned.
Sentences with unfastened
1. Verb, past tense
Your child can elect to wear a necktie with his costume or leave the top button unfastened for a more casual look.
If you prefer to have one, just leave one side of a panel unfastened and block it shut with something heavy or tie it with a bungee cord that you can unfasten when necessary to open it.
3. Verb, base form
There are seven clips around its edges that you can unfastened with your fingers.
4. Verb, past participle
A metal clip should hold the base of the instrument in place; once you have unfastened the clip, remove the base.