Lewis & Short

vincĭbĭlis, e, adj. [vinco].

  1. * I. Pass., that can be easily gained: causa, Ter. Phorm. 1, 4, 48.
  2. II. Act., conquering, victorious: clangor, i. e. of brazen implements in an eclipse of the moon, Poët. ap. Anth. Lat. Burm. 2, p. 329.