Getting tormented is not smart (6)

I believe the answer is:

ragged

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But I can't explain it at all! Could you help me understand?

(Other definitions for ragged that I've seen before include "Like worn-out clothing" , "Poorly clothed; with rough edges" , "Old and torn, clothes say" , "Dagger could be tattered" , "Of clothes, frayed and torn" .)

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