Incredulousness is the state of being skeptical or disbelieving of something. There are several synonyms for incredulousness that can be used in different contexts to convey a similar meaning. The word skepticism is closely related to incredulousness and is often used interchangeably. Another synonym is disbelief, which emphasizes the lack of belief in something. Doubt is also a useful synonym as it implies a hesitancy to accept something as true. Disbelief, skepticism, and doubt are often used in formal settings. Other synonyms for incredulousness include suspicion, surprise, and shock. These words can be used to emphasize the level of disbelief or skepticism being conveyed. Overall, choosing the appropriate synonym for incredulousness will depend on the context and tone of the message being conveyed.