Arrant Ar"rant, a. [OE. erraunt, errant, errand, equiv. to E. errant wandering, which was first applied to vagabonds, as an errant rogue, an errant thief, and hence passed gradually into its present and worse sense. See {Errant}.] Notoriously or pre["e]minently bad; thorough or downright, in a bad sense; shameless; unmitigated; as, an arrant rogue or coward. [1913 Webster]

I discover an arrant laziness in my soul. --Fuller. [1913 Webster]

2. Thorough or downright, in a good sense. [Obs.] [1913 Webster]

An arrant honest woman. --Burton. [1913 Webster]

The Collaborative International Dictionary of English. 2000.