4 adjectives to describe frightfulness

Its "eat 'em-alive" frightfulness was depressing.

Distorted though the man's face was with such bitter frightfulness, she recognized him, not as any one she knew, but merely as one of the tenants in the same apartment building.

" The shadowy proposals of those who preach humanity while they practise unrestricted frightfulness have not deceived the Allies.

The effect of that human intelligence, sheltered in there behind that expressionless celluloid, whose frail thinness they all knew covered unspeakable frightfulness, became uncanny.

4 adjectives to describe  frightfulness