terrible vs horrendous

terrible and horrendous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
terrible	No	Yes	No	No
horrendous	No	Yes	No	No

As adjectives, terrible and horrendous are synonyms defined as:

Other synonyms of terrible include awful, dire, direful, dread, dreaded, dreadful, fearful, fearsome, frightening, horrific.

terrible (adjective)	horrendous (adjective)
causing fear or dread or terror	causing fear or dread or terror
extreme in degree or extent or amount or impact
intensely or extremely bad or unpleasant in degree or quality
exceptionally bad or displeasing