adjective

Complete, utter.

what arrant nonsense!

utter,downright,thoroughgoing,absolute,complete,thorough,through and through,total,unmitigated,outright,out-and-out,real,perfect,consummate,surpassing,sheer,rank,pure,unqualified,inveterate,positive,undiluted,unalloyed,unadulterated,in every respect,unconditional