What did the Romans call the most hated god?

The Romans referred to the most hated god as "Cloacina," who was associated with the Cloaca Maxima, the great sewer of Rome. While the term "hated" may not apply universally, Cloacina was often seen as a necessary but unglamorous deity, representing the darker aspects of urban life and sanitation. Additionally, in a broader context, some Romans viewed deities like Bacchus or Isis with ambivalence, reflecting cultural tensions and differing values.