Underactive

adj

adj ·Rare ·Advanced level

Definitions

Adjective

1
Less than normally active.
"Thus a person with an underactive thyroid can gain weight even on a low-calorie diet."

Adjective

1
abnormally inactive wordnet

Synonyms

hypoactive hypoactive hypoactive inactive

Antonyms

hyperactive overactive

Example

"Thus a person with an underactive thyroid can gain weight even on a low-calorie diet."

Etymology

From under- + active.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.