pertness

The quality or state of being pert.

noun

1. A lively, emphatic, eager quality or manner: animation, bounce, brio, dash, élan, esprit, life, liveliness, sparkle, spirit, verve, vigor, vim, vivaciousness, vivacity, zip. Informal ginger, pep, peppiness. Slang oomph. See action/inaction.
2. The state or quality of being impudent or arrogantly self-confident: assumption, audaciousness, audacity, boldness, brashness, brazenness, cheek, cheekiness, chutzpah, discourtesy, disrespect, effrontery, face, familiarity, forwardness, gall¹, impertinence, impudence, impudency, incivility, insolence, nerve, nerviness, overconfidence, presumptuousness, pushiness, rudeness, sassiness, sauciness. Informal brass, crust, sauce, uppishness, uppityness. See attitude/good attitude/bad attitude/neutral attitude, courtesy/discourtesy.

The noun has one meaning:

Meaning #1: inappropriate playfulness
  Synonyms: impertinence, perkiness, sauciness, archness