Done or made using whatever is available:
— Crossed the river on improvised bridges.

synonyms: jury-rigged, makeshift.

Roget 612: extemporaneous, impulsive, indeliberate^†; snap; improvised, improvisate^†, improvisatory^†; unpremeditated, unmeditated; improvise; unprompted, unguided; natural, unguarded; spontaneous etc. (voluntary) 600; instinctive etc. 601.    ... show more

Roget 674: unprepared etc. (prepare); &c.; 673; without preparation etc. 673; incomplete etc. 53; rudimental, embryonic, abortive; immature, unripe, kachcha^†, raw, green, crude; coarse; rough cast, rough hewn; in the rough; unhewn^†, unformed, unfashioned^†, unwrought, unlabored^†, unblown, uncooked, unboiled, unconcocted, unpolished.    unhatched, unfledged, unnurtured^†, unlicked^†, untaught, uneducated, uncultivated, untrained, untutored, undrilled, unexercised; deckle-edged^†; precocious, premature; undigested, indigested^†; unmellowed^†, unseasoned, unleavened.    unrehearsed, unscripted, extemporaneous, improvised, spontaneous, ad lib, ad libitem [Lat.].    fallow; unsown, untilled; natural, in a state of nature; undressed; in dishabille, en deshabille [Fr.].    unqualified, disqualified; unfitted; ill-digested; unbegun, unready, unarranged^†, unorganized, unfurnished, unprovided, unequipped, untrimmed; out of gear, out of order; dismantled etc. v.. shiftless, improvident, unthrifty, thriftless, thoughtless, unguarded; happy-go-lucky; caught napping etc. (inexpectant) 508^†; unpremeditated etc. 612.    ... show more

Polish: improwizacyjny