Definition of underactive in English:

underactive

Syllabification: un·der·act·ive
Pronunciation: /ˌəndərˈaktiv
 
/

adjective

Insufficiently active: a health problem such as an underactive thyroid
More example sentences
  • There are a number of symptoms associated with an under active thyroid.
  • Not all high cholesterol is caused by an underactive thyroid gland.
  • The symptoms you describe are typical of an underactive thyroid gland.

Definition of underactive in:

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Word of the day guzzle
Pronunciation: ˈgʌz(ə)l
verb
eat or drink (something) greedily