Source : Webster's Revised Unabridged Dictionary (1913)

Abstentious \Ab*sten"tious\, a.
   Characterized by abstinence; self-restraining. --Farrar.

Source : WordNet®

abstentious
     adj : self-restraining; not indulging an appetite especially for
           food or drink; "not totally abstinent but abstemious"
           [syn: {abstinent}]