disobedient; mischievous (used esp. in speaking to or about children)

Weren't we naughty not to eat our spinach?

improper, tasteless, indecorous, or indecent

a naughty word.

Obsolete . wicked; evil.

adjective

behaved , controlled , good , obedient , clean , moral , pure

adjective

annoying , badly behaved , contrary , disobedient , disorderly , evil , exasperating , fiendish , fractious , froward , headstrong , impish , indecorous , insubordinate , intractable , mischievous , obstreperous , perverse , playful , rascally , raunchy , recalcitrant , refractory , rough , rowdy , sinful , teasing , tough , ungovernable , unmanageable , unruly , wanton , wayward , wicked , willful , worthless , wrong , adult , bawdy , blue * , dirty * , hot * , improper , lascivious , lewd , loose * , off-color * , pornographic , purple * , ribald , risqu , steamy , bad , ill-behaved , immodest , indecent , indelicate , unbecoming , unbefitting , unseemly , untoward , forward , immoral , obscene , vulgar , wicket