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.

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