There's no real order because their meaning is not about how deep or shallow the thinking is, it's more about different aspects or ways of thinking. Consider = think about something before making a decision/judgement Think = can be used in many different ways, but with 'about' is similar to consider but less detailed. Guess = when you have an idea/opinion without any idea if it's true or not. Suppose = when you think something is probably true Expect = when you think something will/should happen Assume = accept something is true even though there is no proof Imagine = very similar to 'suppose', bu can also mean to form images in your mind