Maybe

Words that a speaker uses to indicate that he thinks it is possible that something may happen or be true, but he isn't certain.

• What words indicate that maybe something may happen or is true?
  maybe perhaps may might it is possible possibly could who knows? there's a chance you never know conceivably
• What words indicate that the speaker is guessing about a number or amount, but is not certain?
  maybe perhaps possibly
• What words indicate that the speaker is not certain about a suggestion, plan, or idea?
  maybe perhaps