shaky

Synonyms: all aquiver aquake aquiver ashake faltering fluctuant infirm insecure jellylike jerry-built jittery nervous not set precarious quaking quivery rattletrap rickety rocky rootless shaking tottering tottery tremorous tremulous tumbledown unfirm unsettled unsound unstable unsteady unsure vacillating wavering weak wobbly yielding

Antonyms: firm steady unshaky unwavering

Synonyms: dubious indecisive not dependable not reliable precarious problematic questionable suspect uncertain unclear undependable unreliable unsettled unsound unsteady unsupported unsure

Antonyms: certain firm indubious sure