Antonyms for the word "incredible" would include words like "believable," "credible," or "plausible." These terms convey a sense of trustworthiness and indicate that something is true or can be proven. Conversely, words like "improbable," "unbelievable," or "unthinkable" would also be considered antonyms for "incredible." These words suggest that something is so unlikely or far-fetched that it's nearly impossible to believe. Other antonyms may include words like "normal," "average," or "mundane," all of which would indicate that something is not extraordinary, but instead, quite ordinary.