Definition of arrant adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈærənt//
; NAmE NAmE//ˈærənt//
[only before noun](old-fashioned)
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used to emphasize how bad something/somebody is arrant nonsense Word Origin Middle English: variant of errant, originally in phrases such as arrant thief (‘outlawed, roving thief’).
See the Oxford Advanced American Dictionary entry: arrant