Utterly detest is a strong feeling of dislike or hatred. It can be expressed in two words, 'HATE' and 'LOATHE'. The term 'HATE' is a four letter word that expresses intense dislike or animosity towards someone or something. On the other hand, 'LOATHE' is a six letter word that expresses a deep-seated and often irrational hatred or revulsion. Together, these two words express a strong feeling of utter detestation.