Lewis & Short

rancĭdus, a, um, adj. [ranceo, rancens], stinking, rank, rancid.

  1. I. Lit.: cadavera, Lucr. 6, 1155: aper, Hor. S. 2, 2, 89.
  2. II. Trop., disgusting, loathsome, offensive: aspectus, Plin. 22, 22, 46, § 92.
    Comp.: quid rancidius, quam, etc., Juv. 6, 185.
    Sup. does not occur.
    Adv.: rancĭdē, nauseously, disgustingly: ficta verba, Gell. 18, 11, 2; 18, 8, 1.