LAME

adj. 1 crippled, disabled, handicapped, hobbled, limping, incapacitated, impaired, halting, halt, spavined, Colloq US gimpy The mare was found to be lame after the previous day's hunting 2 feeble, weak, flimsy, thin, unconvincing, unpersuasive, awkward, clumsy, poor, ineffective, Colloq half-baked Refusing to go because you have a headache sounds like a pretty lame excuse to me