Fee·ble-mind·ed a. Weak in intellectual power; wanting firmness or constancy; irresolute; vacillating; imbecile. “comfort the feeble-minded.”
-- Fee*ble-mind*ed*ness, n.
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feebleminded
adj 1: retarded in intellectual development [syn: backward]
2: mentally deficient [syn: half-witted, slow-witted]