can't cut it

flawed inadequate incomplete

impaired missing needed needing short

coming up short defective deprived of minus not hacking it not making it sans without

abundant enough having profuse sufficient

helpless impotent inadequate incapable not able powerless sidelined unfit weak

can't hack it can't make the grade clumsy hog-tied impuissant incapacitated incompetent ineffectual inefficacious inefficient inept inoperative no can do no good not cut out for not equal to not up to out of commission unfitted unqualified unskilled

able capable competent fit potent qualified strong sufficient

adequate skillful talented