underactive

[uhn-der-ak-tiv]

un·der·ac·tive

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

Origin:
1955–60; under- + active

un·der·ac·tiv·i·ty, un·der·ac·tive·ness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Underactive is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Collins
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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