WordNet sense 1 (deviating widely from a norm of physical or mental ability; used especially of children below normal in intelligence):

exceptional

WordNet sense 2 (deviating from normal expectations; somewhat odd, strange, or abnormal):

atypical, irregular

WordNet sense 3 (deviating from the general or common order or type):

anomalous

WordNet sense 4 (markedly different from an accepted norm):

aberrant, deviant, deviate, deviate

WordNet sense 5 (not within reasonable limits):

immoderate