from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Not suited to circumstances or needs; unsuitable: improper shoes for a hike; improper medical treatment.
- adj. Not in keeping with conventional mores; indecorous: improper behavior.
- adj. Not consistent with established truth, fact, or rule; incorrect.
- adj. Irregular or abnormal.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. unsuitable to needs or circumstances; inappropriate; inapt
- adj. Not in keeping with conventional mores or good manners; indecent or immodest
- adj. Not according to facts; inaccurate or erroneous
- adj. Not consistent with established facts; incorrect
- adj. Not properly named; See, for example, improper fraction
- v. To appropriate; to limit.
- v. To behave improperly
from the GNU version of the Collaborative International Dictionary of English
- adj. Not proper; not suitable; not fitted to the circumstances, design, or end; unfit; not becoming; incongruous; inappropriate; indecent
- adj. Not peculiar or appropriate to individuals; general; common.
- adj. Not according to facts; inaccurate; erroneous.
- transitive v. To appropriate; to limit.
from The Century Dictionary and Cyclopedia
- Not proper or peculiar to any individual; general; common.
- Not of a proper kind or quality; not adapted to or suitable for the purpose or the circumstances; unfit; unbecoming; indecorous: as, an improper medicine; an improper appointment; improper conduct or language.
- Not proper in form or method; not according to nature, truth, rule, or usage; abnormal; irregular; erroneous: as, improper development; improper fractions; improper pronunciation; an improper use of words.
- To impropriate.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. not suitable or right or appropriate
- adj. not appropriate for a purpose or occasion
- adj. not conforming to legality, moral law, or social convention
From Latin improprius ("not proper"), from in- + proprius ("proper"). (Wiktionary)