25B6; adjective
don't be so feeble-minded : STUPID, idiotic, imbecilic, foolish, witless, doltish, empty-headed, vacuous; informal half-witted, moronic, dumb, dim, dopey, dozy, dotty, dippy; Brit. informal daft.
(dated) the segregation of the feeble-minded : HAVING LEARNING DIFFICULTIES, having special (educational) needs, backward, simple, slow, (mentally) retarded; dated educationally subnormal, ESN; informal mental.
clever, gifted.