Is Terriblest a Word?

ter·ri·blest.

Is terribleness a word?

adj. 1. Causing great fear or alarm; dreadful: a terrible bolt of lightning; a terrible curse.

What does Terrifle mean?

The original meaning of terrible was anything that causes terror. That meaning still applies, but mostly this is a word for anything really bad. Terrible used to be reserved for things that caused fear and terror, but today we use the word to describe anything awful, lousy, or just plain bad.