Similar word to frailer:

brittle,dainty,decrepit,delicate,feeble, fishy,flimsy, fracturable,fragile, frangible, infirm,insubstantial, puny,sad, shatterable, shattery, sickly,slender,slight,slim,tender,tenuous,thin, unsound, unsubstantial,vulnerable, wimpy, wishy-washy, wispy