think, opine, suppose, imagine, reckon, guess -- (expect, believe, or suppose; "I imagine she earned a lot of money with her new novel"; "I thought to find her in a bad state"; "he didn't think to find her in the kitchen"; "I guess she is angry at me for standing her up")
guess, venture, pretend, hazard -- (put forward, of a guess, in spite of possible refutation; "I am guessing that the price of real estate will rise again"; "I cannot pretend to say that you are wrong")
estimate, gauge, approximate, guess, judge -- (judge tentatively or form an estimate of (quantities or time); "I estimate this chicken to weigh three pounds")
guess, infer -- (guess correctly; solve by guessing; "He guessed the right number of beans in the jar and won the prize")