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.
References in periodicals archive ?
There is lots of good, hard-hitting stuff about the imbecilities of religious fanatics and frauds of all stripes, but the tone is smug and the logic occasionally sloppy." JIM HOLT
"They serve very well," he wrote, "to show what effect the lynching spirit, if it is allowed to go unchecked, has upon the minds of simple people--even upon the more literate minority thereof." The Eastern Shore, Mencken wrote, was being run by "its poor white trash" that still accepted "the brutish imbecilities" of the Ku Klux Klan.
Quicker and cheaper telephoning and, of course, e-mail and the internet (if you've got the patience to put up with its many imbecilities designed to frustrate us).