ˈarənt also ˈer- adjective
Etymology: alteration of errant
1. : wandering or roving about : itinerant , vagrant
an arrant thief
2.
a. : out-and-out , thoroughgoing , confirmed , extreme
arrant individualists pursuing separate courses — C.M.Smith
his own perilous air of arrant omniscience — C.E.Montague
b. : notoriously or outstandingly bad : shameless
is an arrant coward and shows the white feather at the slightest display of pluck in his antagonist — John Burroughs
• ar·rant·ly adverb