Synonyms of illegitimate

1 Syllable
wrong
2 Syllables
pricey, wrongful, spurious, wicked, pricier
3 Syllables
improper, criminal, pirated, overkill, invalid, contraband, outlawed, illicit, illegal, unlawful
4 Syllables
unlicensed, unapproved, extralegal, unsanctioned, misbegotten, unauthentic, indictable, clandestine, unreasoned
5 Syllables
unauthorized, under-the-counter, supposititious
6 Syllables
unconstitutional