Frightened

A Frightened creature flees from the source of its fear as best it can. A frightened creature takes a -2 penalty on all attack rolls, saving throws, skill checks, and ability checks. A frightened creature can use special abilities to flee; indeed, the creature must use such means if they are the only way to escape.

Frightened is like shaken, except that it is a more extreme form of fear, and the creature must flee if possible.