SPECULATE

(GUESS) [verb] - to form opinions about something without having the necessary information or facts; to make guessesI don't really know what happened - I'm just speculating. [I]So far, the police can only speculate on the possible motives for the killing. [I]A spokesperson declined to speculate on the cause of the train crash. [I]Journalists are speculating about whether interest rates will be cut. [I]I wouldn't like to speculate how much that car must have cost him. [+ wh- word]It would be wrong to speculate why she resigned. [+ wh- word]It has been speculated that dinosaurs became extinct because the Earth's climate changed. [+ that clause]