Unbelievable is a word that describes something that is difficult to accept or comprehend. However, there are several antonyms for the word that describe things that are easy to believe or accept. These antonyms include credible, plausible, realistic, probable, and convincing. Credible refers to something that is believable or trustworthy. Plausible means something that is conceivable, acceptable, and reasonable. Realistic refers to something that resembles reality and is believable. Probable denotes something that is likely to happen based on evidence or circumstances. Convincing means something that is persuasive and makes sense. Using these antonyms for unbelievable can help us describe situations or events that are easily understood, believable, and convincing.