1599 (implied in tersely), "clean-cut, burnished, neat," from Fr. ters "clean," from L. tersus "wiped off, clean, neat," from pp. of tergere "to rub, polish, wipe." Sense of "concise or pithy in style or language" is from 1777, which led to a general sense of "neatly concise." The pejorative meaning "brusque" is a fairly recent development.