downright; thorough; unmitigated; notorious: an arrant fool.
Origin of arrant
1350–1400; Middle English, variant of errant
Synonyms for arrant
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for arrantly
Historical Examples of arrantly
utter; out-and-outan arrant fool
Word Origin for arrant
C14: a variant of errant (wandering, vagabond); sense developed from its frequent use in phrases like arrant thief (hence: notorious)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
late 14c., variant of errant (q.v.); at first merely derogatory, "wandering, vagrant;" then (1540s) acquiring a meaning "thoroughgoing, downright, notorious."
Online Etymology Dictionary, © 2010 Douglas Harper