Tom bertindak seolah-olah acuh.

English Translation

Tom pretended to be ignorant.

FYI: “Acuh” is actually “careful”, “concerned” or “paying attention”. KBBI registers these meanings only. However, “acuh tak acuh” means “unconcerned” or “indifferent”. As a result, “acuh” itself is frequently used as the opposite meanings, according to SEAlang Library dictionary. It might be safer to use the full expression “acuh tak acuh” in a formal writing instead of “acuh”.