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All answers having "Oppressive" as clue:

4 Character Answers:

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DIRE



5 Character Answers:

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CLOSE

HEAVY



6 Character Answers:

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STICKY



7 Character Answers:

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ONEROUS



8 Character Answers:

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STIFLING



10 Character Answers:

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BURDENSOME



11 Character Answers:

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HEAVYHANDED