It is not particularly aggressive, but will hiss loudly when disturbed.

Air hissed loudly out of the ballast tanks, and that was it.

The car was cruising on the main road into town when the radio hissed loudly and a call came through.

The car park was below the level of the water and the sea hissed loudly as it surged against the outer walls.

He hissed loudly in the darkness, having taken it for part of his dream.

Air hissed loudly out of the chamber while he watched the pressure gauges.

No alarms sounded, but something hissed loudly in the darkness.

They will lift their heads up off the ground, hiss loudly, and strike repeatedly.

He'd taken less than four steps when a hulking form 17 blocked his way, hissing loudly.

And stopped when the door cracked open and began to hiss loudly.