Definition of perfect crime in English:

perfect crime

Syllabification: per·fect crime

noun

A crime so ingeniously contrived and carefully executed that it cannot be detected or solved.
More example sentences
  • It was the perfect crime, but a crime nonetheless.
  • Her action has led to the arrest of the partner and her son, who believed they had executed a perfect crime.
  • A gang of misfits are rounded up to commit the perfect crime, but the bungling burglars bite off more than they can chew in this screwball comedy.

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Word of the day flippant
Pronunciation: ˈflipənt
adjective
not showing a serious or respectful attitude