(s)impudent, insolent, snotty-nosed, flipmarked by casual disrespect“a flip answer to serious question”, “the student was kept in for impudent behavior”
(s)fresh, impertinent, impudent, overbold, smart, saucy, sassy, wiseimproperly forward or bold“don't be fresh with me”, “impertinent of a child to lecture a grownup”, “an impudent boy given to insulting strangers”, “Don't get wise with me!”