When something seems too incredible or unlikely to be true, we often describe it as "difficult to believe." But there are many other ways to express this sentiment. For example, we might say that something is hard to accept, incredible, unbelievable, or improbable. We might describe it as impossible, preposterous, or incredulous. Other synonyms include mind-boggling, fantastical, and far-fetched. Depending on the context and tone of the conversation, some people might use words like absurd, ridiculous, or nonsensical to express their disbelief. Regardless of the specific words used, when something is difficult to believe, it can be a challenge to convince others of its veracity.