nagging, creaky, gimpy, malfunctioning, troublesome, sore, wonky, temperamental, bothersome, herniated disc, strained, cranky, niggling, subpar, iffy, wobbly, clunky, achy, finicky, mechanical, faulty, ailing, arthritic, gluteus muscle, undependable, shaky, peskiest, recalcitrant, sluggish, quadriceps, erratic, shin splints, gluteal muscle, vexing, nonfunctioning, lousy, crank, wayward, limp, cantankerous, stress fracture, rustier, hammy, labrums, bulky, trapezius muscle, intercostal muscle, cumbersome, carpal tunnel syndrome, badminton racket, knotty, rickety, unreliable, hamate bone, aggravating, charley horse, flexor muscle, crummy, wimpy, ingrown toenail, wiper motor, rhomboid muscle, sweat gland, sputtered, cotter pin, spotty, leaky, oblique, ornery, gas pedal, lingering, bedfast, stiff, unthreaded, hamate, serviceable, fitful, san marinese, teres major, biceps, ungainly, unwieldy, clumsier, fractured, epidural injection, trapezius, ignition switch, horizontal stabilizer, pectoralis, stub axle, faltering, earthbound, screwy, unsynchronized, ignition coil, nettlesome, imperfect, feeble, strep throat, beefy, gimbaled, abdominal muscle, strayed, fractious, frisky, restive, skittish, tethered, docile, fed, obedient, powered, footed, headstrong, jaded, lazy, scrawny, tempered, bred

balking, intractable