The phrase "frightening rate" means something is happening very fast and it is making people scared or frightened.
Sentences with «frightening rate»
However, the amount of malware targeting Macs has actually grown at a frightening rate over the past years. (businessinsider.com)
The UN has «not seen a refugee outflow escalate at such a frightening rate since the Rwandan genocide almost 20 years ago,» said UN high commissioner for refugees António Guterres at a New York meeting this summer. (christianitytoday.com)
The years passed, mankind became stupider at a frightening rate. (religion.blogs.cnn.com)