WordNet sense 1 (not normal; not typical or usual or regular or conforming to a norm):

abnormal

WordNet sense 2 (having an intended meaning altered or misrepresented):

distorted, twisted, misrepresented

WordNet sense 3 (not straightforward or candid; giving a false appearance of frankness):

artful, disingenuous

WordNet sense 4 (marked by immorality; deviating from what is considered right or proper or good):

depraved, immoral, perverse, reprobate

WordNet sense 5 (lacking in integrity):

corrupt