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Related to underactively: hypothyroidism, Underactive thyroid


Characterized by insufficient or abnormally low activity: an underactive area of the brain.

un′der·ac·tiv′i·ty (-ĭ-tē) n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. not sufficiently active
2. (Medicine) med (of the thyroid or adrenal glands) not functioning at full capacity
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌʌn dərˈæk tɪv)

insufficiently active: an underactive thyroid gland.
un`der•ac•tiv′i•ty, n.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.underactive - abnormally inactiveunderactive - abnormally inactive      
inactive - not active physically or mentally; "illness forced him to live an inactive life"; "dreamy and inactive by nature"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.