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

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v. Third-person singular simple present indicative form of soften.

"When he sees me, his expression softens, but only a modicum."

softened    softening    softens   

change    modify    alter   

mitigate    mollify   

truckle   

mollify    palliate    compose    mitigate    assuage    enervate   

often   

widen    weaken    tighten    dilatation    stiffen    disarray    postscript    qualm    paleness    strengthen