The phrase "sank in to" refers to the act of something or someone gradually being absorbed, understood or accepted. Antonyms for this phrase may include words such as "rejected," "resisted," "repelled," or "disputed." These words suggest a lack of acceptance, acknowledgement or assimilation. Other antonyms may include "ignored," "isolated," "disconnected," or "disengaged," which imply a disinterest or non-involvement with something or someone. It is important to note that the antonyms of "sank in to" will depend on the context in which the phrase is used, as the opposite of understanding or acceptance varies based on the specific situation.