tricky

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complicated

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tough

adj 0.731

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hard

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problem

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dangerous

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complex

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stressful

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daunting

adj 0.604

abstruse

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intricate

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puzzling

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distressful

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hardscrabble

adj 0.591

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harsh

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uneasy

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uphill

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fastidious

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frustrating

adj 0.583

elusive

adj 0.582

risky

adj 0.581

hassle

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intractable

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convoluted

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cumbersome

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distressing

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touchy

adj 0.576

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different

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strange

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delicate

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hardball

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adj 0.569

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fussy

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adj 0.562

rigorous

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stiff

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finicky

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knotty

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hardy

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