Someone feebleminded is unintelligent. A feebleminded person lacks smarts and does dumb stuff like bring a pit bull to a cat show or drive a convertible in a snow storm. A feebleminded person has a feeble, or weak, mind.

To be feebleminded is to be mentally slow. People with an IQ below a certain number are feebleminded in a technical sense. But this word is used more often for people who act dumb without the benefit of a medical excuse. Riding a bike without a helmet is feebleminded. Challenging a cheetah to a running race is feebleminded. To be feebleminded is to act like an idiot.

Definitions of feebleminded
  1. adjective
    retarded in intellectual development
    synonyms: backward, half-witted, slow-witted
    relatively slow in mental or emotional or physical development
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