failing Synonyms

lacking flunk declining unsuccessful weakness ailing regressive relapsing retrogressive screwing regressing shortcoming sinking slipping unwell unsufficient unsuccess unstable unreliable toothless successless slumping vice recessive putrescence missing miscarrying miscarriage marcescent losing limitation lapse languishing moribund muffing neglect pretermission preterition peccadillo peccability omissive omission nonperformance nonfulfillment recreancy waning not succeeding unpersuasive spoilation unsatisfying