01 a. Notoriously or preëminently bad; thorough or downright, in a bad sense; shameless; unmitigated; as, an arrant rogue or coward.
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1.
Notoriously or preëminently bad; thorough or downright, in a bad sense; shameless; unmitigated; as, an arrant rogue or coward.“I discover an arrant laziness in my soul.” — Fuller.
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2.
Thorough or downright, in a good sense.[Obs.]“An arrant honest woman.” — Burton.