Lewis & Short

per-făcĭlis, e, adj.

  1. I. Very easy (class.): perfacilis et expedita defensio, Cic. Fin. 3, 11, 36 Madv. N. cr.: disciplina cognitu perfacilis, id. Tusc. 4, 3, 6; id. Leg. 2, 7, 17: perfacile factu esse conata perficere, Caes. B. G. 1, 3.
  2. II. In partic., very courteous (class.): perfacilis in audiendo, Cic. de Or. 1, 20, 93.
    Hence, adv., in two forms: perfacile (class.) and ‡ perfacul.
    1. A. perfăcĭlē.
      1. 1. Very easily (class.): perfacile hunc hominem de medio tolli posse, Cic. Rosc. Am. 7, 20: sese tueri, id. Verr. 2, 5, 4, § 8: apparere, id. Fin. 2, 33, 209.
      2. 2. Very willingly (ante-class.): perfacile patior, Att. ap. Non. 5, 40 (Trag. Rel. v. 9 Rib.); Plaut. Most. 3, 1, 93.
    2. B. perfăcŭl antiqui et per se facul dicebant, quod nunc facile dicimus, Fest. p. 214 Müll.; cf. Paul. ex Fest. p. 215 Müll.