Nappy hair is not good. Nappy hair is hair that is very tangled and messy and is not very attractive. To avoid nappy hair, one should brush hair often and avoid situations which would cause this nappy hair. But it's all a matter of opinion really.
It would depend on what you mean by "nappy". Some consider tightly coiled hair to be nappy hair and there is nothing wrong or bad with this hair trait as long as it it taken care of and managed like all hair types should be.
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