The phrase "palled up" can be defined as two or more people becoming close friends or forming a close relationship. The antonyms of "palled up" can be various, depending on the context. Some possible antonyms include disconnected, estranged, indifferent, distant, cool, reserved, and aloof. Each of these antonyms suggests a lack of closeness or bond between the individuals in question. To "pall up" usually indicates a positive connection between friends or acquaintances, so its antonyms generally imply a negative state, such as absence of sympathy, alienation, or even hostility, towards one another.