1. [ verb ] make too low an estimate of
Synonyms: underrate

"he underestimated the cost of the renovation" "Don't underestimate the danger of such a raft trip on this river"

Related terms: overestimate misjudge sell_short
2. [ verb ] make a deliberately low estimate
Synonyms: lowball

"The construction company wanted the contract badly and lowballed"

Related terms: estimate
3. [ verb ] assign too low a value to
Synonyms: undervalue

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

Related terms: overvalue overvalue value undervaluation
4. [ noun ] (mathematics,psychology) an estimation that is too low; an estimate that is less than the true or actual value
Synonyms: underrating underreckoning underestimation
Related terms: estimate lowball undervalue
Similar spelling:   underestimation