"sassier" in the adjective sense
1. fresh, impertinent, impudent, overbold, smart, saucy, sassy, wise
improperly 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!"
Source: WordNet® (An amazing lexical database of English)
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