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Synonyms

overestimate

American  
[oh-ver-es-tuh-meyt, oh-ver-es-tuh-mit] / ˌoʊ vərˈɛs təˌmeɪt, ˈoʊ vərˈɛs tə mɪt /

verb (used with object)

overestimated, overestimating
  1. to estimate at too high a value, amount, rate, or the like.

    Don't overestimate the car's trade-in value.

  2. to hold in too great esteem or to expect too much from.

    Don't overestimate him—he's no smarter than you are.


noun

  1. an estimate that is too high.

overestimate British  

verb

  1. (tr) to value or estimate too highly

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

noun

  1. an estimate that is too high

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

  • overestimation noun

Etymology

Origin of overestimate

First recorded in 1815–25; over- + estimate

Explanation

If you're confident your favorite team will win the championship even though the star player is injured, you may want to reconsider: don't let your team spirit cause you to overestimate, or overvalue, the team's abilities. When you estimate something, you make a calculation or a judgment of its value. So, when you overestimate, you assign too much value to the thing you are judging. If you overestimate how much time you have left to get to school, you could be late. Likewise, if you overestimate how prepared you are for a test, you might end up with a poor grade. This verb is the opposite of underestimate, or “to assign too little value.”

Keep Reading on Vocabulary.com

Vocabulary lists containing overestimate

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

We always overestimate the speed at which these transitions disrupt existing industries.

From Barron's • Mar. 27, 2026

As Amara’s Law says, we overestimate a technology’s short-term impact and underestimate its long-term effects.

From The Wall Street Journal • Jan. 19, 2026

Armour's letter said that education was facing a gap of £250m, and he could not "overestimate the financial challenge we face in seeking to address our funding gap".

From BBC • Jan. 13, 2026

“Sometimes there’s an overestimate of voters’ desire to tax other people,” said the Tax Foundation’s Walczak.

From MarketWatch • Jan. 10, 2026

As a result we tend to overestimate the importance of new technology and underestimate the rate of production and the impact of new intellectual tools.

From "The Invention of Science" by David Wootton