Lewis & Short

perflābĭlis, e, adj. [perflo].

  1. I. Pass., that can be blown through.
    1. A. Prop. (rare but class.): deos inducere perlucidos et perflabiles, Cic. Div. 2, 17, 40: terra, Sol. 27: lacernae, Amm. 14, 6, 9: locus, exposed to the wind, airy, App. M. 4, p. 150 med.; Pall. 1, 36, 3.
    2. B. Fig., susceptible (postclass.): gentes perflabiles ad omnes dissensionum motus, Amm. 30, 7, 10.
  2. II. Act., blowing through: aër, Pall. 1, 6, 9; cf.: domus perflabili tinnitu fidium resultantes, Amm. 14, 6, 18.