a complete coward.
a consummate fool.
a double-dyed villain.
a perfect idiot.
a thorough nuisance.
a thoroughgoing villain.
an arrant fool.
an exhaustive study.
gross negligence.
made a thorough search.
pure folly.
stark staring mad.
the unadulterated truth.
thoroughgoing research.
utter nonsense.
what a sodding mess.