Princeton's WordNet

1. underestimate, underestimation, underrating, underreckoning(verb)

   an estimation that is too low; an estimate that is less than the true or actual value

2. undervalue, underestimate(verb)

   assign too low a value to

   "Don't underestimate the value of this heirloom-you may sell it at a good price"

3. lowball, underestimate(verb)

   make a deliberately low estimate

   "The construction company wanted the contract badly and lowballed"

4. underestimate, underrate(verb)

   make too low an estimate of

   "he underestimated the work that went into the renovation"; "Don't underestimate the danger of such a raft trip on this river"

Kernerman English Learner's Dictionary

1. underestimate(verb)ˌʌn dərˈɛs təˌmeɪt; n. -mɪt, -ˌmeɪt

   to think sb is not as good or able as they actually are

   Don't underestimate him - he's quiet, but smart.

2. underestimateˌʌn dərˈɛs təˌmeɪt; n. -mɪt, -ˌmeɪt

   to think that sth is not as difficult, dangerous, etc. as it actually is

   The experts underestimated the hurricane's force.

Wiktionary

1. underestimate(Noun)

   An estimate or perception that is too low.

2. underestimate(Verb)

   To perceive (someone or something) as having a lower value, quantity, worth etc. than what it actually has.

Webster Dictionary

1. Underestimate(verb)

   to set to/ low a value on; to estimate below the truth

2. Underestimate(noun)

   the act of underestimating; too low an estimate

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