This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Simple past tense and past participle of dampen.

"The fact that they spoke in English dampened a rich, emotional moment and also erased the kudos"

dampened    dampening    dampens   

soften    break    damp    weaken    check   

depress    check    lessen    deaden    moisten   

grav    uncalibrated    time-variant    nonphysical    zone-expansion