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understate [understated, understating, understates]▼(to state something with less completeness than needed)
verb
[UK: ˌʌn.də.ˈsteɪt] [US: ˈʌn.dər.ˌstet]

belittle [belittled, belittling, belittles]▼(to knowingly say that something is smaller or less important than it actually is)
verb
[UK: bɪ.ˈlɪt.l̩] [US: bə.ˈlɪt.l̩]

underestimate [underestimated, underestimating, underestimates]▼(to perceive as having lower value)
verb
[UK: ˌʌn.də.ˈre.stɪ.meɪt] [US: ˈʌn.də.ˈre.stə.ˌmet]

underrate [underrated, underrating, underrates]▼(to underestimate)
verb
[UK: ˌʌn.də.ˈreɪt] [US: ən.dər.ˈreɪt]