adj.1 a unseemly; indecent. b not in accordance with accepted rules of behaviour.
2 inaccurate, wrong.
3 not properly so called.
Phrases and idioms:
improper fraction a fraction in which the numerator is greater than or equal to the denominator.
Derivatives:
improperly adv.
Etymology: F impropre or L improprius (as IN-(1), PROPER)