Definition: The word "possible" means that something is likely to happen in some way but not certain exactly when it will happen or how it will be. For example: The teacher said that he could give a good lesson on Monday, but I'm not sure if it will work as well on Tuesday. On the other hand, "possibly" means that something is highly likely to happen or happens in some way; but it's not certain exactly when it will happen or how it will be. For example: The teacher told me that he was going to give a presentation on Monday, and I'm not sure if it'll go well on Tuesday. The word "possibly" is used as an adverb indicating the possibility of something happening in some way.