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All answers having "Adequate" as clue:

3 Character Answers:

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DUE



4 Character Answers:

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DOZE

ENOW

ENUF

FAIR

FULL

OKAY

PILL

SOSO



5 Character Answers:

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AMPLE



6 Character Answers:

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DECENT

ENOUGH

USABLE



7 Character Answers:

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UPTOPAR



8 Character Answers:

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ABITMUCH

ALLRIGHT

PASSABLE



10 Character Answers:

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SUFFICIENT



12 Character Answers:

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SATISFACTORY