guesswork, supposition, imagination, fancy, inference, deduction, presumption, predisposition, reckoning, surmise, theorizing, taking for granted, positing, postulating, assuming, presuming, opinion, going by dead reckoning, leaping to conclusions*, going by guess and by God*.
"guessing." YourDictionary, n.d. Web. 11 August 2018. <http://thesaurus.yourdictionary.com/guessing>.
guessing. (n.d.). Retrieved August 11th, 2018, from http://thesaurus.yourdictionary.com/guessing