Causing or able to cause fear
Very bad or unpleasant
Frightful executions in the island followed his fall.
The jobbing was frightful, and is probably inseparable from wholesale operations of this kind.
Under such a system the most frightful excesses were possible and many cases of brutal cruelty were laid bare.
It was this character of Sicily which led to its one frightful piece of local history.
And he had only one wish-- that the frightful thing that had to happen should happen quickly.