Meanings
adjectiveunderactive (comparative more underactive, superlative most underactive)
comparative more underactive · superlative most underactive
- Less than normally active.
Thus a person with an underactive thyroid can gain weight even on a low-calorie diet.
1989 Apr, John A. McDougall, “Healthy by Choice”, in Vegetarian TimesSynonyms: hypoactive
Synonyms & antonyms
adjectiveLess than normally active.
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Opposite
More synonyms by meaning
adjectiveabnormally inactive
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Also see
Synonym sets from Open English WordNet, CC BY 4.0.
Origin
Rhymes & wordplay
Rhymes with underactive
activeinteractiveattractiveinactiveradioactivereactiveproactiverefractiveunattractivehyperactiveextractiveoveractiveimmunoreactivesubtractivetractivefactivecontractiveabstractivecounteractivedetractivedistractiveenactivehyperreactivehypoactive
All rhymes →Cite this entry
APA
underactive. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/underactive
MLA
“underactive.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/underactive. Accessed November 2, 2026.
Chicago
WatkinsX Dictionary, s.v. “underactive,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/underactive.
Source: underactive on Wiktionary, CC BY-SA 4.0.