1. So deep as to be unmeasurable; unfathomable; SYN. abyssal.
2. Very great; limitless
3. Resembling an abyss in depth; so deep as to be unmeasurable
Extremely alarming; SYN. hair-raising, nightmarish.
ETYM Old Eng. horrible, orrible, Old Fren. horrible, orrible, French horrible, from Latin horribilis, from horrere. Related to Horror.
1. Detestable; aweful.
2. Ugly.
To an appalling extent.