How do you spell Improper

Available Definitions:
1)  a. - Not proper; not suitable; not fitted to the circumstances, design, or end; unfit; not becoming; incongruous; inappropriate; indecent; as, an improper medicine; improper thought, behavior, language, dress.
2)  a. - Not peculiar or appropriate to individuals; general; common.
3)  a. - Not according to facts; inaccurate; erroneous.
4)  v. t. - To appropriate; to limit.