Etymology
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arrant (adj.)

late 14c., variant of errant (q.v.); at first merely derogatory, "wandering, vagrant;" then (16c.) gradually losing its opprobrious force and acquiring a meaning "thoroughgoing, downright, notorious."

updated on February 09, 2017

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Definitions of arrant from WordNet

arrant (adj.)
without qualification; used informally as (often pejorative) intensifiers;
an arrant fool
Synonyms: complete / consummate / double-dyed / everlasting / gross / perfect / pure / sodding / stark / staring / thorough / thoroughgoing / utter / unadulterated
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.