This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Not fastened

v. Past participle of unfasten

adj. affording unobstructed entrance and exit; not shut or closed

adj. not closed or secured

adj. not tied

adj. not buttoned

"As he spoke, he unfastened from the leathern strap that went across his shoulders a small tin box, and, opening it for a moment, let Siegfried peep at a bright carmine-coloured mass of something within."

fasten    zip    button up    button    tie up    zip up    do up   

unfastened    unfastening    unfastens   

open    open up   

loose    unfix    unbind    untie    unloose    loosen    unloosen    unscrew    unhitch    unhasp   

cutaway    kerseymere    calfskin    silver-laced    hand-knitted    well-starched    unlabelled    black-and-yellow    single-breasted    deep-cut