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All answers having "Soften" as clue:

3 Character Answers:

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DIM

RHO



4 Character Answers:

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EASE

MELT

TAME

THAW

WILT



5 Character Answers:

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ALLAY

RELAX

RIPEN



6 Character Answers:

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EASEUP

RELENT

TEMPER



7 Character Answers:

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ASSUAGE

UNSTEEL



8 Character Answers:

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MITIGATE

MODULATE

PALLIATE