under active

underactive

[uhn-der-ak-tiv]
adjective
insufficiently active: an underactive thyroid gland.

Origin:
1955–60; under- + active

underactivity, underactiveness, noun
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World English Dictionary
underactive (ˌʌndərˈæktɪv)
 
adj
(of the thyroid or adrenal glands) not functioning at full capacity

Collins English Dictionary - Complete & Unabridged 10th Edition
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