1) Adhoc 2) Ad-lib 3) Faked it 4) Impermanent 5) Impromptu 6) Made up 7) Makeshift 8) Off the cuff 9) Stopgap 10) Temporary 11) Unprepared 12) Vamped Found on https://www.crosswordclues.com/clue/improvised
jury-riggedadjective done or made using whatever is available; `crossed the river on improvised bridges`; `the survivors used jury-rigged fishing gear`; `the rock served as a makeshift hammer` Found on https://www.encyclo.co.uk/local/20974