The phrase "act hostile" is correct and usable in written English.
It can be used to describe someone behaving in an unfriendly or aggressive manner towards others.
Example: "During the meeting, he began to act hostile when his ideas were challenged by his colleagues."
Alternatives: "behave aggressively" or "display hostility".
Don't punish your animals if they act hostile, they are just acting on instincts.
The walls of such rooms are dull, their lights are harsh, and hunkered down in most of them are a jittery suspect and two clever cops, one of whom tends to act hostile and volatile, the other one solicitous and calm.
They may cut off slower walkers, act hostile toward those not moving at their desired pace or feel no remorse when bumping into a stranger, according to NPR.
Some people are very protective and may act hostile towards you if they are unaware that your difficulties are due to Asperger's Syndrome.
Explaining how Asperger's Syndrome affects you usually allows people like this to understand you better and they will be less likely to act hostile towards you in the future.
First, visions usually bear a normative character; technologies, as described in visions are flexible and user-friendly, except those depicted in the "worst-case scenarios" where technique is opposed to and acts hostile towards human beings.
He was convicted of committing "acts hostile to the DPRK".
Acting hostile towards your followers will never help you, and will almost always do the opposite.
If your pet acts hostile to your advances, leave them alone and don't try to further your bond for a moment.
Johnson said he had not seen fans act that hostile toward a home team since his rookie season with the Jets, in 1996.
Some people may act more hostile towards you if they find out that you have Asperger's Syndrome.
