prolific

Mr Welby announced last Tuesday that he would step down from the role after a review found he "could and should" have reported a prolific child abuser to police.

Savile was one of Britain’s most notorious and prolific sex offenders.

It comes after the Archbishop of Canterbury resigned over his failure to report prolific child abuser John Smyth.

By the mid '80s he was believed to be the most prolific high-grade hashish smuggler in the business, importing thousands of tonnes of cannabis into the UK and US.

So why did "the most prolific serial abuser to be associated with the Church of England", as the report described Smyth, avoid prosecution?