feebleminded

/ˈfibəlˌmaɪndɪd/
adjective
  1. Having very low intelligence or mental ability; unable to think or understand clearly. (Note: This term is now considered outdated and offensive when used to describe people with intellectual disabilities.)
    • The old textbook used the term 'feebleminded' to describe people with learning disabilities.
    • In the past, feebleminded children were often sent to special institutions.
    • He called the plan feebleminded, meaning it was foolish and poorly thought out.
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