I would guess Uglúk on the assumption that he is the only one never to have encountered the Nazgul.
Fatty Bolger was menaced by them at Crickhollow.
Gríma Wormtongue, according to one account in UT, directed them towards the Shire.
Gloìn, I think, was one of those that encountered the Nazgul that visited Erebor.
Grishnákh, being an Orc of Mordor, must have encountered one.
Uglúk on the other hand, being an Orc of Isengard, maybe never had that pleasure.
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