Lewis & Short

percontātīvus (percunct-), a, um, adj. [percontor],

  1. I. universally known (postclass.), Cael. Aur. Tard. 4, 8, 114.
  2. II. In gram., interrogative: modus, Diom. p. 328 P.
    Adv.: percontātīvē, inquiringly, Charis. p. 161 P.