Hostility was a negative attitude towards others that could include ill will, enmity, and denigration.
Several of J'Vini's criminal charges included hostile intent. (DIS: "Choose to Live")
In a situation where four strangers were abducted and confined to a small room, they might become suspicious of each other. There would be false accusations against one or more of them being in collaboration with the abductors, creating hostility between the strangers which could lead to violence and ending with their suspicions destroying them. (TNG: "Allegiance")