odium (n.)

c. 1600, "fact of being hated," from Latin odium "ill-will, hatred, grudge, animosity; offense, offensive conduct," related to odi "I hate" (infinitive odisse), from PIE *eod-io- "hatred" (source also of Greek odyssasthai "to be angry, be grieved, grumble," Armenian ateam "I hate," Old Norse atall, Old English atol "evil, dire, horrid, loathsome"). Meaning "hatred, detestation" is from 1650s. Often in an extended form, such as odium theologicum "hatred which is proverbially characteristic of theological disputes" (1670s).