unsuitable to needs or circumstances; inappropriate; inapt
Not properly named; See, for example, improper fraction
Not in keeping with conventional mores or good manners; indecent or immodest
Not consistent with established facts; incorrect
Of a complex random variable, correlated with its conjugate
Not according to facts; inaccurate or erroneous
Used other than figuratively or idiomatically: see over, fence.
Entering, or having entered, the airfield in preparation for landing.