"Un duer" is a French term that translates to "hard to bear" or "unbearable" in English, and there are several other synonyms that can be used to convey a similar meaning. Some of these synonyms include "intolerable," "insufferable," "gruesome," "ghastly," "horrible," "unendurable," "irksome," "exasperating," "irritating," "exasperating," "tedious," and "wearisome." All these words evoke a sense of discomfort or annoyance, suggesting that something is too difficult to endure or put up with. Using synonyms like these can help to express the impact of a particular situation or event on the psyche, especially when trying to communicate a strong sense of emotional discomfort or pain.