Dictionary.com
definitions

arrant

[ar-uhnt]
adjective
  1. downright; thorough; unmitigated; notorious: an arrant fool.
  2. wandering; errant.

Origin of arrant

1350–1400; Middle English, variant of errant
Related formsar·rant·ly, adverb
Can be confusedarrant errant

Synonyms for arrant

1. thoroughgoing, utter, confirmed, flagrant.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for arrantly

Historical Examples of arrantly

  • You make me feel that I have been driving you—arrantly egotistic.

    The Dull Miss Archinard

    Anne Douglas Sedgwick

  • Twice her lips moved to the verge of speech; yet, caught so arrantly in the act, she was unable to phrase any passing thought.

British Dictionary definitions for arrantly

arrant

adjective
  1. utter; out-and-outan arrant fool
Derived Formsarrantly, adverb

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
Word Origin and History for arrantly

arrant

adj.

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