Letter 78 and the essay Quendi and Eldar in WotJ provide the possiblity of an attested to translation for 'Uruk-hai'. Letter 78 says "Urukhai is only a figure of speech. There are no genuine Uruks, that is folk made bad by the intention of their maker". The pertinent portion of this is "folk made bad". In Q&E we learn that 'uruk' was borrowed by Sauron from the Elvish tongues when he was devising the Black Speech in the Second Age, and was related to words meaning 'horrible'.
If Uruks are "folk made bad" and 'uruk' is related to horrible, and 'horrible' and 'bad' are synonmous, then it could very well be that a reasonable translation of Uruk-hai (which is used interchangeably with its anglicization 'uruks') is:
Uruk-hai: *bad-folk, *horrible-folk.
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Tar-Elenion
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