[ad_1] adjective
- downright; thorough; unmitigated; notorious: an arrant fool.
- wandering; errant.
adjective
- utter; out-and-outan arrant fool
late 14c., variant of errant (q.v.); at first merely derogatory, “wandering, vagrant;” then (1540s) acquiring a meaning “thoroughgoing, downright, notorious.”