1. with excessive speed or urgency; hurriedly:"maybe I acted too hastily"Similarquicklyhurriedlyin a hurryfastswiftlyrapidlyspeedilybrisklyexpeditiouslywithout delaypost-hasteat high speedat full speedwith all speedat full tiltat the speed of lightas fast as possiblewith all possible hastelike a whirlwindlike an arrow from a bowat breakneck speedas fast as one's legs can carry oneat a runat a gallophotfooton the doublecursorilyperfunctorilybrieflyfleetinglysketchilysuperficiallyinformal:double quickin double quick timep.d.q. (pretty damn quick)nippilylike (greased) lightninghell for leatherlike madlike crazylike blazeslike the windlike a bomblike nobody's businesslike a scalded catlike the deucea mile a minutelike a bat out of hellat warp speedat a rate of knotslike the clapperslike billy-olickety-splitliterary:apacehurriedlyspeedilyquicklyin a hurryimpetuouslyimpulsivelyrecklesslyprecipitatelyprecipitouslyrashlyincautiouslyimprudentlyon the spur of the momentprematurelyOppositeslowlycarefullydeliberately