adjective

tentative, unsure, or slow in acting or speaking.

clients are hesitant about buying

uncertain,undecided,unsure,doubtful,in doubt,dubious,tentative,half-hearted,ambivalent,sceptical,reluctant,nervous,having misgivings,having qualms,hanging back,stalling,delaying,irresolute,hesitating,indecisive,dithering,vacillating,wavering,oscillating,shilly-shallying,in two minds,in a quandary,in a dilemma,on the horns of a dilemma,havering,humming and hawing,iffy,dilly-dallying,blowing hot and cold,cunctatory,lacking confidence,diffident,timid,shy,bashful,insecure,self-effacing,stammering,stuttering,stumbling,faltering