Horrendous
Part of speech: adjective
Definition: Extremely bad; awful; terrible.
Example sentence: The worst job that I ever did, I used to have a Saturday job cleaning the dough off bread-making machines for Warburtons in Bolton. That was horrendous.
Terrible
Part of speech: adjective
Definition: Dreadful; causing alarm and fear.Most formidable.Intense; extreme in degree or extent.Unpleasant; disagreeable.Very bad; lousy.
Example sentence: The fishermen know that the sea is dangerous and the storm terrible, but they have never found these dangers sufficient reason for remaining ashore.