Lively, Impertinent Crossword Clue

Lively, impertinent crossword clue. A quick one crossword question in Daily Telegraph on Thursday, 6 July 2017. 4 letters.

Answer: PERT

Definition of: Impertinent
n. characterized by a lightly pert and exuberant quality
n. not pertinent to the matter under consideration
n. improperly forward or bold

Example:

Henry Thrale, one of the most opulent brewers in the kingdom, a man .of sound and cultivated understanding, rigid principles, and liberal spirit, was married to one of those clever, kind-hearted, engaging, vain, pert young women who are perpetually doing or saying what is not exactly right, but who, do or say what they may, are always agreeable.