Rancor (noun)

Bitter resentment or ill will; deep-seated hatred.

Origin:

It comes from the latin word "rancor" meaning bitterness or resentment.

Examples:

1. There was a lot of rancor between the two political parties.
2. The rancor between the siblings had been brewing for years.
3. The employee's dismissal caused rancor among his colleagues.
4. The public dispute was filled with rancor and personal attacks.
5. The couple's divorce was filled with rancor and bitterness.