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Related to inadequate personality: Asthenic personality disorder
inadequate personality[in′ad·ə·kwət pərs·ən′al·əd·ē]
An individual showing no obvious mental or physical defect, but characterized by inappropriate or inadequate response to intellectual, emotional, and physical demand, and whose behavior pattern shows inadaptability, ineptitude, poor judgment, lack of stamina, and social incompatibility.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.