horrendous vs direful

horrendous and direful both are adjectives.

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

As adjectives, horrendous and direful are synonyms defined as:

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

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