arrantyoudaoicibaDictYouDict[arrant 词源字典]
arrant: [16] Arrant is an alteration of errant, as in knight errant. This originally meant ‘roaming, wandering’, but its persistent application to nouns with negative connotations, such as rogue and thief, gradually drove its meaning downwards by association, to ‘notorious’.
=> errant[arrant etymology, arrant origin, 英语词源]