Animosity (noun)

1. Feeling of strong dislike or enmity.
2. A feeling of strong hostility or opposition towards someone or something.

Origin:

Late middle english: from latin animositas, from animosus "spirited", from animus "mind".

Examples:

1. There was a lot of animosity between the two countries.
2. The animosity between the two groups grew over time.
3. His animosity towards her was clear in the way he spoke to her.
4. The animosity in the room was palpable.
5. The animosity he felt towards his brother was palpable.