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Webster 1913 Edition

Noun.

The quality or state of being pert.

Noun.

Briskness; smartness.

Sauciness; forward promptness or boldness; implying less than effrontery or impudence.

Pertness and ignorance may ask a question in three lines, which it will cost learning and ingenuity thirty pages to answer.

Petty liveliness; sprightliness without force,dignity or solidity.

There is in Shaftsbury's works a lively pertness and a parade of literature.

pertness ‎(countable and uncountable, plural pertnesses)

The quality of being pert; cheekiness, impudence.
- 1983, Lawrence Durrell, Sebastian, Faber & Faber 2004 (Avignon Quintet), p. 1021:
  He was completely bald and had a heavy, Chinese-looking countenance which contained, deeply embedded, two eyes of penetration and pertness, always twinkling on the edge of laughter.
The quality of being pert; firmness (usually of breasts).