Origin: 1200–50; Middle English, aphetic variant of apert < Old French < Latin apertus open (past participle of aperīre;see aperient); in Middle English and Old French, influenced by Old French aspert < Latin expertusexpert
c.1300 (implied in pertly), "evident, unconcealed," aphetic form of apert "open, frank," from O.Fr. apert, from L. apertus, pp. of aperire "to open" (see overt). Sense of "saucy, bold" first recorded late 14c. Less pejorative meaning "lively, brisk, in good spirits" (c.1500)