The Collaborative International Dictionary of English v.0.48:

Pert \Pert\, a. [An aphetic form of OE. & OF. apert open, known,
   true, free, or impudent. See Apert.]
   1. Open; evident; apert. [Obs.] --Piers Plowman.
      [1913 Webster]

   2. Lively; brisk; sprightly; smart. [Obs.] --Shak.
      [1913 Webster]

   3. Indecorously free, or presuming; saucy; bold; impertinent.
      "A very pert manner." --Addison.
      [1913 Webster]

            The squirrel, flippant, pert, and full of play.
                                                  --Cowper.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pert \Pert\, v. i.
   To behave with pertness. [Obs.] --Gauden.
   [1913 Webster]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006):

PERT
       Program Evaluation / Evolution and Review Technique


Moby Thesaurus II by Grady Ward, 1.0:

114 Moby Thesaurus words for "pert":
   active, activist, activistic, aggressively self-confident, alert,
   alive, animate, animated, arch, arrogant, audacious, bantam,
   biggety, bluff, bold, bouncing, bouncy, brash, brassy, brazen,
   breezy, bright, brisk, bubbly, bumptious, challenging, cheeky,
   cheerful, chesty, chipper, chirk, chirpy, chirrupy, chutzpadik,
   cocky, conceited, contemptuous, crusty, daring, defiant, defying,
   derisive, disdainful, disregardful, disrespectful, ebullient,
   effervescent, energetic, enthusiastic, facy, flip, flippant,
   forward, fresh, frisky, full of go, full of life, full of pep,
   gally, gay, gratuitous, greatly daring, ill-mannered, immodest,
   impertinent, impolite, impudent, insolent, jaunty, jolly, keen,
   know-it-all, live, lively, malapert, mercurial, militant, nervy,
   nimble, obtrusive, out of line, overwise, peacockish, peacocky,
   peart, peppy, perk, perky, presumptuous, puffed up, quicksilver,
   regardless of consequences, rude, sassy, saucy, self-conceited,
   self-opinionated, smacking, smart, smart-alecky, smart-ass, snappy,
   spanking, spirited, sprightly, spry, stuck-up, swelled-headed,
   uncalled-for, uncivil, unmannerly, vivacious, wise-ass, zingy