"How nasty" (3)

I think it could be either:

ugh

ick

(Other definitions for ugh that I've seen before include "Yuck (colloq.)" , "Kind of hug - it's disgusting" , "Expression of disgust" , "expression of revulsion" , "I'm disgusted!" .)

I've seen this clue in The Wall Street Journal and the LA Times.

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