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The Collaborative International Dictionary
Abstentious

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

Wiktionary
abstentious

a. Characterized by abstinence; self-restraint.

WordNet
abstentious

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