a.
1.
Impudent, unblushing, unabashed, immodest, frontless, assuming, brazen, brazen-faced, bold-faced, insolent, audacious, cool, indecent, indelicate.
2.
Depraved, vicious, sinful, unprincipled, corrupt, profligate, dissolute, reprobate, abandoned, graceless, obdurate, hardened, incorrigible, irreclaimable, lost.