underactive

play
adjective un·der·ac·tive \ˌən-dər-ˈak-tiv\

Definition of underactive

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

underactivity

play \ˌən-dər-ak-ˈti-və-tē\ noun

1959

First Known Use of underactive

1959


UNDERACTIVE Defined for English Language Learners

underactive

play
adjective un·der·ac·tive \ˌən-dər-ˈak-tiv\

Definition of underactive for English Language Learners

  • : not active enough


Medical Dictionary

underactive

play
adjective un·der·ac·tive \-ˈak-tiv\

Medical Definition of underactive

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

underactivity

\-ak-ˈtiv-ət-ē\play 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

capable of being altered or controlled

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • peter-bruegel-tower-of-babel-painting
  • What language does pajama come from?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
SCRABBLE® Sprint

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!