fearsome vs horrendous

fearsome and horrendous both are adjectives.

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

As adjectives, fearsome and horrendous are synonyms defined as:

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

fearsome (adjective)	horrendous (adjective)
causing fear or dread or terror	causing fear or dread or terror