Crossword Genius

Elvish giant oddly dismissive over nothing (5)

Ross

I believe the answer is:

nihil

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'nothing' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

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(Other definitions for nihil that I've seen before include "'... obstat' - Catholic imprimatur or approval" , "Nothing (Latin)" , "love" .)

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