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/ˈɡɛs.tə.mət/ · noun
(informal) An estimate that is hardly any better than a guess, often because it is based on insufficient or unreliable data..
Near-synonym: educated guess
I'm not sure how many people were at the festival. My best guesstimate is 50,000.
Use guesstimate when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Guesstimate means (informal) An estimate that is hardly any better than a guess, often because it is based on insufficient or unreliable data..
Common synonyms include educated guess, guestimate.
The opposite depends on the specific sense.
Near-synonym: educated guess
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