Hostile

Hostile is the state of a creature where they automatically attack party members observed in their line of sight. A creature can be neutral or ally at first, then turn hostile in reaction to a party member's actions (dialogue, attacking, picking/looting/lockpicking red objects, stealing, etc).

While hostile, a creature is highlighted in red (neutral is highlighted in yellow, ally in green, main character in blue and other party members in white) and during combat, their portrait has a red border. Holding Left Shift or entering  stealth mode reveals a (hostile) creature's line of sight – also known as "red vision cones" or "Sneak Cones".

Outside of combat, hostile creatures often do not attack certain  familiars of party members, even while plainly visible.

See also

•  Temporarily Hostile