Webster's Revised Unabridged Dictionary · 1913

Pert

Pert , adjective

[An aphetic form of Old English & Old French apert open, known, true, free, or impudent. See Apert.]

1.
Open; evident; apert. [Obsolete] — Piers Plowman
2.
Lively; brisk; sprightly; smart. [Obsolete] — Shakespeare
3.
Indecorously free, or presuming; saucy; bold; impertinent.
A very pert manner. — Addison
The squirrel, flippant, pert, and full of play. — Cowper

Pert , intransitive verb

To behave with pertness. [Obsolete] — Gauden