English

Adjective

underactive ‎(comparative more underactive, superlative most underactive)

1. Less than normally active.
   • 1989 Apr, John A. McDougall, “Healthy by Choice”, in Vegetarian Times:

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

Synonyms

• hypoactive

Antonyms

• overactive