Not in keeping with conventional mores or good manners; indecent or immodest
unsuitable to needs or circumstances; inappropriate; inapt
Not properly named; See, for example, improper fraction
Not consistent with established facts; incorrect
Of a complex random variable, correlated with its conjugate
Not according to facts; inaccurate or erroneous
Risqué, sexy, racy; mildly pornographic.
Of, pertaining to, or containing spice.
Vigorous; colorful; stimulating.
Tangy, zesty, or pungent.
Scandalous.
Provoking a burning sensation due to the presence of chilis or similar hot spices