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Synonyms
im·be·cile (ĭḿbə-sĭl, -səl)

[From obsolete French imbécille, weak, feeble, from Old French, from Latin imbēcillus, in-, not; see in–1, + possibly bacillum, staff diminutive of baculum, rod.]

noun 

  1. A stupid or silly person; a dolt.
  2. A person whose mental acumen is well below par.
  3. A person of moderate to severe mental retardation having a mental age of from three to seven years and generally being capable of some degree of communication and performance of simple tasks under supervision. The term belongs to a classification system no longer in use and is now considered offensive.

adjective 

  1. Stupid; silly.
  2. Well below par in mental acumen.

derivatives

iḿbe·cile·ly
adverb