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underestimate

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verb [transitive] underestimate pronunciation in British English /ˌʌndərˈestɪˌmeɪt/ 
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present tense
I/you/we/theyunderestimate
he/she/itunderestimates
present participleunderestimating
past tenseunderestimated
past participleunderestimated

Related dictionary definitions

  1. 1
    to think that someone has less power or ability than they really have

    Their big mistake was to underestimate their opponents' skill in handling the news media.

  2. 2
    to think or guess that something is smaller, less important etc than it really is

    We had seriously underestimated the cost of fitting a new kitchen.

    The importance of a good diet should not be underestimated.

derived word

underestimation

 underestimate pronunciation in British English /ˌʌndərˌestɪˈmeɪʃ(ə)n/  noun [countable/uncountable]
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singularunderestimation
pluralunderestimations

creep

used with other nouns to describe the unexpected and often unwanted effects of a particular situation or trend

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