horrendous vs dire

horrendous and dire both are adjectives.

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

As adjectives, horrendous and dire are synonyms defined as:

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

horrendous (adjective)	dire (adjective)
causing fear or dread or terror	fraught with extreme danger; nearly hopeless
	causing fear or dread or terror