When someone cannot bear or tolerate something, they may use the phrase "can't stomach." However, there are several synonyms that can be used to convey this sentiment in slightly different ways. For instance, one can say "cannot abide" when referring to something that is deeply unsettling or unpleasant. "Hate" is another synonym that implies a strong aversion or distaste for something. Other synonyms include "detest," "loathe," "dislike," or "abhor" - all of which describe a feeling of repulsion or revulsion. Ultimately, these words can effectively communicate a sense of disgust or discomfort towards something, providing nuance and specificity in expression.