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All answers having "-- -friendly" as clue:

3 Character Answers:

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ECO



4 Character Answers:

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KIND

NICE

USER

WARM



5 Character Answers:

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LATHE

PALLY

THERE



6 Character Answers:

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ALLIED

AMICAL

CHUMMY

FRIZZY

GENIAL

HEARTY

SOCIAL



7 Character Answers:

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AFFABLE

AMIABLE

CORDIAL

ENEMIES



8 Character Answers:

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AMENABLE

AMICABLE

PAMPERED

SOCIABLE



9 Character Answers:

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CONGENIAL

FRATERNAL

WELCOMING



10 Character Answers:

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PALLIATIVE



11 Character Answers:

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GOODNATURED



12 Character Answers:

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APPROACHABLE



15 Character Answers:

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ONFAMILIARTERMS

ONSPEAKINGTERMS