guesstimate
noun/ˈɡestɪmət/
/ˈɡestɪmət/
(also guestimate)
(informal)- an attempt to calculate something that is based more on guessing than on informationTopics Doubt, guessing and certaintyc2More Like This Blended or portmanteau wordsBlended or portmanteau wordsWord Origin1930s (originally US): blend of guess and estimate.
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guesstimate