1) Endocrine disease 
Adipsia is a condition that can affect both humans and other animals and involves an absence of thirst. Its underlying causes vary but have included anomalies involving the hypothalamus, pituitary and corpus collosum. Although Diabetes insipidus usually involves polydipsia, it can also rarely occur not just in the absence of polydipsia but in the ...
absence or lack of thirst
(from the article `endocrine system, human`) There are two disorders in which this regulatory mechanism is dysfunctional. The first is termed adipsia (hypodipsia) and is a rare disorder in which ...
Absence of thirst or the lack of desire to drink. ... Origin: G. A-priv. + dipsa, thirst ... (05 Mar 2000) ... 
(ә-dip´se-ә) absence of thirst; abnormal avoidance of drinking.
Type: Term Pronunciation: ă-dip′sē-ă, -dip′sē Definitions: 1. Absence of thirst or the lack of desire to drink.
The absence of thirst; avoidance of drinking.
adipsia The abnormal absence of thirst; an abnormal avoidance of drinking.