Synonyms of unlicensed

2 Syllables
banned, wrongful, taboo, lawless, bootleg
3 Syllables
improper, criminal, flagitious, forbidden, outlawed, illicit, illegal, nefarious, unlawful
4 Syllables
prohibited, extralegal, iniquitous, actionable
5 Syllables
unauthorized, under-the-counter
6 Syllables
illegitimate