- arraunt (obsolete)
Alteration of errant. Originally meaning wandering (errant), the term came to be an intensifier due to its use as an epithet, e.g. in the phrases "arrant thieves" and "arrant knaves" (i.e., wandering bandits).
- Utter; complete.
- arrant nonsense! 
- Alternative spelling of errant.
Particularly used in the phrase “arrant knaves”, quoting Hamlet, and “arrant nonsense”.
Some dictionaries consider arrant simply an alternative form of errant, but in usage they have long split.
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- ^ OED
- ^ Thomas Bennet, A Brief History of the Joint Use of Recompos'd Set Forms of Prayer...to wich is annexed a Discourse of the Gost of Prayer], p. 187
- ^ Safire, 2006, considers “arrant nonsense” to be “wedded words”, a form of a fixed phrase.