【Horrible】 ,  【horrid】 ,  【horrific】 ,  【horrendous】  mean inspiring horror or abhorrence.

【Horrible】  (see also FEARFUL 2 ) is the general term for what inspires horror.

【Horrid】 , often practically synonymous with  【horrible】 , sometimes carries a stronger implication of inherent or innate offensiveness or repulsiveness. In modern colloquial usage the word is often weakened to a general term of aversion.

【Horrific】  (see also FEARFUL 2 ), a somewhat bookish term, stresses the power to horrify.

【Horrendous】  is used chiefly in producing a literary effect (as the suggestion of extreme frightfulness, an apt rhyme for tremendous or stupendous, or an onomatopoeic rhythm).