YOU SAID:

i held a great animosity

INTO JAPANESE

私は大きな敵意を抱いていた

BACK INTO ENGLISH

I had great hostility

INTO JAPANESE

すごい敵意を持ってた

BACK INTO ENGLISH

I had a lot of hostility.

INTO JAPANESE

すごく敵意を持っていました。

BACK INTO ENGLISH

He was very hostile.

INTO JAPANESE

彼はとても敵意を持っていました。

BACK INTO ENGLISH

He was very hostile.