Source : Webster's Revised Unabridged Dictionary (1913)

Cautelous \Cau"te*lous\, a. [F. cauteleux, LL. cautelosus. See
   {Cautel}.]
   1. Caution; prudent; wary. [Obs.] ``Cautelous, though
      young.'' --Drayton.

   2. Crafty; deceitful; false. [Obs.] --Shak. --
      {Cau"te*lous*ly}, adv. -- {Cau"te*lous*ness}, n. [Obs.]