to be extreme or very strange and therefore impossible to believe, describe, or explain

The chaos at the airport defies description. 机场一片混乱，难以用语言形容。

His speed when he's running defies belief.

This is a level of wickedness that defies explanation.

The originality of her ideas almost defies description.

Despite all that we know about the octopus, many aspects of its behaviour still defy explanation.