over·​es·​ti·​mate | \ˌō-vər-ˈe-stə-ˌmāt \
overestimated; overestimating

Definition of overestimate 

(Entry 1 of 2)

transitive verb

: to estimate or value (someone or something) too highly … the senator had been so responsible about his potential tax liabilities that he had substantially overestimated what he owed the government.— David Burnham … our habit of overestimating our knowledge and underestimating our ignorance …— David A. Shaywitz The emotional power of this reunion can't be overestimated.— Joe Klein "I mean that I am afraid I overestimated him. I don't think that he is a painter of the first rank."— Henry James


over·​es·​ti·​mate | \ˌō-vər-ˈe-stə-mət \
plural overestimates

Definition of overestimate (Entry 2 of 2)

: an estimate that is too high overestimates of the company's future profits Diamond still attacks the growth projections that the utilities have put forward, arguing that the … figures were overestimates— Norman Boucher

Synonyms & Antonyms for overestimate

Synonyms: Verb

overrate, overvalue

Antonyms: Verb

underestimate, underrate, undervalue

Visit the Thesaurus for More 

First Known Use of overestimate


1797, in the meaning defined above


1828, in the meaning defined above

Keep scrolling for more

Learn More about overestimate

Share overestimate

Statistics for overestimate

Look-up Popularity

Time Traveler for overestimate

The first known use of overestimate was in 1797

See more words from the same year

Keep scrolling for more

More Definitions for overestimate


over·​es·​ti·​mate | \ˌō-vər-ˈe-stə-ˌmāt\
overestimated; overestimating

Kids Definition of overestimate

: to estimate too highly I overestimated the number of guests.

Keep scrolling for more

More from Merriam-Webster on overestimate

Rhyming Dictionary: Words that rhyme with overestimate

Thesaurus: All synonyms and antonyms for overestimate

Spanish Central: Translation of overestimate

Nglish: Translation of overestimate for Spanish Speakers

Comments on overestimate

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


a nest or breeding place

Get Word of the Day daily email!

Test Your Vocabulary

Late Autumn 2018 Words of the Day Quiz

  • frosted-autumn-leaves
  • Which is a synonym of yahoo?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Bee Cubed

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


Love words? Need even more definitions?

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