underactive

[ uhn-der-ak-tiv ]
/ ˌʌn dərˈæk tɪv /

adjective

insufficiently active: an underactive thyroid gland.

Origin of underactive

First recorded in 1955–60; under- + active

OTHER WORDS FROM underactive

un·der·ac·tiv·i·ty, un·der·ac·tive·ness, noun

Words nearby underactive

under-the-counter, under-the-table, underachieve, underachiever, underact, underactive, underage, underarm, underarmed, underbearer, underbelly

British Dictionary definitions for under-activity

underactive
/ (ˌʌndərˈæktɪv) /

adjective

(of the thyroid or adrenal glands) not functioning at full capacity