underactive

[uhn-der-ak-tiv]

adjective

1. insufficiently active.

   an underactive thyroid gland.

underactive

/ ˌʌndərˈæktɪv /

adjective

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

Other Word Forms

• underactivity noun
• underactiveness noun

Word History and Origins

Origin of underactive¹

First recorded in 1955–60; under- + active

Example Sentences

Based on a physical examination, other symptoms and medical history, the health practitioner suspects that the patient could be suffering from any of the following: anemia, an underactive thyroid or diabetes.

Read more on Salon

Laura is 41 and has Down's syndrome, asthma and an underactive thyroid.

Read more on BBC

Following the treatment, Eleanore has lost a significant amount of her eyesight, while she has an underactive thyroid and adrenal insufficiency.

Read more on BBC

"Mental illness is described as overactive emotion circuits and underactive cognitive control circuits. That's how almost every single mental illness is described."

Read more on Salon

Of oral drugs to treat underactive thyroid, 66 percent contain lactose.

Read more on Washington Post