underactive

adjective un·der·ac·tive \ ˌən-dər-ˈak-tiv \
Updated on: 2 Apr 2018

Definition of underactive

: characterized by an abnormally low level of activity
  • an underactive thyroid gland

underactivity

play \ˌən-dər-ak-ˈti-və-tē\ noun

Recent Examples of underactive from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'underactive.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of underactive

1959


UNDERACTIVE Defined for English Language Learners

underactive

Definition of underactive for English Language Learners

  • : not active enough


Medical Dictionary

underactive

adjective un·der·ac·tive \ -ˈak-tiv \

medical Definition of underactive

: characterized by an abnormally low level of activity
  • an underactive thyroid gland

underactivity

play \-ak-ˈtiv-ət-ē\ noun, plural underactivities

Seen and Heard

What made you want to look up underactive? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

investment of mental or emotional energy

Get Word of the Day daily email!

Test Your Vocabulary

Odd Habits and Quirks Quiz

  • image1926873504
  • Which of the following best describes an easily irritated person?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Citation

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!