Roget's Thesaurus: Entry 483 (Underestimation)

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#483. Underestimation. -- N. underestimation; depreciation &c. (detraction) 934; pessimism, pessimist; undervaluing &c. v.; modesty &c. 881.

V. underrate, underestimate, undervalue, underreckon[obs]; depreciate; disparage &c. (detract) 934; not do justice to; misprize, disprize; ridicule &c. 856; slight &c. (despise) 930; neglect &c. 460; slur over.

make light of, make little of, make nothing of, make no account of; belittle; minimize, think nothing of; set no store by, set at naught; shake off as dewdrops from the lion's mane.

Adj. depreciating, depreciated &c. v.; unvalued, unprized[obs].