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

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adj. created by improvisation; impromptu; unrehearsed.

v. Simple past and past participle of improvise.

adj. done or made using whatever is available

"Despite donations and the promise of book and movie deals, most of the 33 Chilean miners trapped more than two months have returned to lives of struggle in improvised homes, often in gang-ridden neighborhoods lacking basic services."

improvised    improvises    improvising   

execute    do    perform    contend    deal   

off the cuff    impromptu    extemporaneous   

improvised    improvising    improvisational    improvisation   

extemporize    invent   

Ais    Allies    Guise    Guys    Lise   

acetylene    unexploded    nonlethal    unpackaged