beggar belief (or description)
Be too extraordinary to be believed or described: a disregard for common sense which beggars belief...- It beggars belief that a group of local councillors can really believe there is any merit in this option.
- ‘Cave-in’ doesn't even begin to describe mismanagement so far off the scale as to beggar belief.
- Although the inadequate measures to deal with the problem beggar belief, what is even more incredible is the mentality of a farmer or a householder who will dispose of their rubbish by dumping it into the nearest river.
See parent entry: beggar