English language nonsense.

Okay, this is just something that's been bothering me for awhile.  Why is it that horrific and terrific are not used the same?  That is, horrific comes from the latin horrificus which is basically to shudder or tremble.  So naturally we use horrific to describe something horrifying and awful such as a gruesome murder scene.  Terrific, on the other hand, we use to describe something that's extremely good or wonderful.  Pretty bizarre and unintuitive considering terrific comes from the latin terrificus which means frighten.  Yikes.