Lewis & Short

văpĭdus, a, um, adj. [vapor], that has emitted steam or vapor, i. e. that has lost its life and spirit, spoiled, flat, vapid.

  1. I. Lit.: vinum, Col. 12, 5, 1.
  2. II. Transf., spoiled, bad.
    1. A. Lit.: pix, Pers. 5, 148.
    2. B. Trop.: astutam vapido servas sub pectore vulpem, Pers. 5, 117.
      Adv.: văpĭdē, poorly, badly, ill: se habere, for male se habere, a favorite expression of Augustus, Suet. Aug. 87.