arrant

Complete; downright; utter.

an arrant knave    arrant nonsense

And if any manner of perſon attempted to moue the King to infringe any parte of thys ordynaunce, and that being knowne, for the firſt time, he ſhould be depriued of his goodes and poſſeſſions, and for the ſecond time, to be drawen thorough the Citie, and so put to execution as an arrant traytor.

Very bad; despicable.

[W]ho ſo forward to accuſe, to debaſe, to revile, to crow-treade an other as the arranteſt fellow in a country?

The truth on't is, mine's as arrant a VVidow-Mother, to her poor Child, as any's in Engand: She vvo'nt ſo much as let one have ſix-pence in one's Pocket, to ſee a Motion, or the Dancing of the Ropes, or—

Obsolete form of errant (“roving around; wandering”).

Hence arrant preachers, humming out / A common-place or two, […]

A surname.