underestimate

[v. uhn-der-es-tuh-meyt; n. uhn-der-es-tuh-mit, -meyt]
verb (used with object), underestimated, underestimating.
1.
to estimate at too low a value, rate, or the like.
verb (used without object), underestimated, underestimating.
2.
to make an estimate lower than that which would be correct.
noun
3.
an estimate that is too low.

Origin:
1805–15; under- + estimate

underestimation, noun


1. undervalue, underrate, misjudge, miscalculate.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
underestimate (ˌʌndərˈɛstɪˌmeɪt)
 
vb
1.  to make too low an estimate of: he underestimated the cost
2.  to think insufficiently highly of: to underestimate a person
 
n
3.  too low an estimate
 
usage  Underestimate is sometimes wrongly used where overestimate is meant: the importance of his work cannot be overestimated (not cannot be underestimated)
 
underesti'mation
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

underestimate
1812, "to estimate at too low an amount," from under + estimate (v.). Meaning "to rank too low, undervalue" is recorded from 1850.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
There are many signs that he actually underestimated the gravity of the crisis.
None of those moments, however seemingly negligible, should be underestimated.
As a result, policymakers persistently underestimated the severity of the
  crisis.
Being underestimated is, for some people, a misfortune.
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