The word "horrendous" in English means: Extremely unpleasant or bad; causing great horror or disgust., Shockingly dreadful; extremely shocking and unacceptable..
The phonetic transcription of "horrendous" is /hɒˈrendəs/ in British English and /hɔːˈrendəs/ in American English. Click the 🔊 button to hear both pronunciations.