Synonyms and related words :
abortive, bootless, crumbling, decrepit, disintegrating, failed, failing, fruitless, futile, ineffective, ineffectual, inefficacious, infirm, lame, manque, miscarried, miscarrying, of no effect, poor, poorish, rotten, rotten at, stickit, stillborn, successless, unfirm, unfortunate, unsolid, unsound, unstable, unsubstantial, unsuccessful, useless