\Vol"u*ble\, a. [L. volubilis, fr. volvere, volutum, to
roll, to turn round; akin to Gr. ? to infold, to inwrap, ? to
roll, G. welle a wave: cf. F. voluble. Cf. F. {Well} of
water, {Convolvulus}, {Devolve}, {Involve}, {Revolt}, {Vault}
an arch, {Volume}, {Volute}.]
1. Easily rolling or turning; easily set in motion; apt to
   roll; rotating; as, voluble particles of matter.

2. Moving with ease and smoothness in uttering words; of
   rapid speech; nimble in speaking; glib; as, a flippant,
   voluble, tongue.

         [Cassio,] a knave very voluble.       --Shak.

Note: Voluble was used formerly to indicate readiness of
      speech merely, without any derogatory suggestion. ``A
      grave and voluble eloquence.'' --Bp. Hacket.

3. Changeable; unstable; fickle. [Obs.]

4. (Bot.) Having the power or habit of turning or twining;
   as, the voluble stem of hop plants.

{Voluble stem} (Bot.), a stem that climbs by winding, or
   twining, round another body. -- {Vol"u*ble*ness}, n. --
   {Vol"u*bly}, adv.