underactive

adj

underactive

adj

Etymology From under- + active.

1

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 Times:

Synonyms: hypoactive
Antonyms: overactive
Derived terms: underactive thyroid

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.