Xenophobic

Isolationist dwarves despise non-dwarven humanoids. They speak only Dwarven and do not gain any bonus languages from possessing a high Intelligence score. In addition, they learn only one language per 2 ranks of Linguistics they possess. However, their untrusting nature gives them a +1 bonus against mind-affecting effects, except for fear affects. This racial trait replaces a dwarf’s normal languages.