Example : An arrant fool.
A complete coward.
A consummate fool.
A double-dyed villain.
Gross negligence.
A perfect idiot.
Pure folly.
What a sodding mess.
Stark staring mad.
A thorough nuisance.
A thoroughgoing villain.
Utter nonsense.
The unadulterated truth.

Synonyms : complete, consummate, double-dyed, everlasting, gross, perfect, pure, sodding, staring, stark, thorough, thoroughgoing, unadulterated, utter