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underactive

[uhn-der-ak-tiv] /ˌʌn dərˈæk tɪv/
adjective
1.
insufficiently active:
an underactive thyroid gland.
Origin
1955-1960
1955-60; under- + active
Related forms
underactivity, underactiveness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for under active

underactive

/ˌʌndərˈæktɪv/
adjective
1.
(of the thyroid or adrenal glands) not functioning at full capacity
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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