Synonyms and related words :
aberrant, abnormal, abominable, actionable, against the law, anarchic, anarchistic, anomic, atrocious, banned, barred, black-market, bootleg, chargeable, contraband, contrary to law, criminal, delinquent, deviant, disgraceful, evil, exceptionable, felonious, flawed, forbade, forbid, forbidden, hardly the thing, ignominious, illegal, illegitimate, illicit, impermissible, improper, inappropriate, incorrect, indecorous, infamous, iniquitous, interdicted, intolerable, irregular, justiciable, lawless, nefarious, nonconstitutional, nonlegal, nonlicit, nonpermissible, not done, not permitted, not the thing, objectionable, off limits, off-base, off-color, out of bounds, out-of-line, outlaw, outlawed, prohibited, proscribed, punishable, ruled out, sacrilegious, scandalous, shameful, shameless, sinful, taboo, tabooed, terrible, triable, unallowed, unauthorized, unconstitutional, under the ban, under the table, under-the-counter, under-the-table, undue, unfit, unfitting, unlicensed, unofficial, unpermissible, unrighteous, unsanctioned, unseemly, unstatutory, unsuitable, untouchable, unwarrantable, unwarranted, verboten, vetoed, wicked, wrong, wrongful