imbecile

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imbecile

Psychol a person of very low intelligence (IQ of 25 to 50), usually capable only of guarding himself against danger and of performing simple mechanical tasks under supervision
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

imbecile

[′im·bə·səl]
(psychology)
A person of middle-grade mental deficiency; the individual's mental age is between 3 and 7 years.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.