RhymeZone: arrant definitions

Definitions of Arrant:

name: A surname (common: 1 in 100000 families; popularity rank in the U.S.: #18829)

adjective: (chiefly with a negative connotation, dated) Complete; downright; utter.
adjective: (by extension, dated) Very bad; despicable.
noun: A surname.
adjective: Obsolete form of errant (“roving around; wandering”). [Straying from the proper course or standard, or outside established limits.]

(Definitions from Wiktionary)