i Register
In some senses, guesstimate is marked as informal. Watch for register when choosing this word.
guesstimate
UK /ˈɡɛs.tə.mət/ US /ˈɡɛs.tə.mət/
verb 2noun 1
Definitions
noun
1
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.
verb
1
To make a guesstimate.
2
To make a guesstimate of a specific quantity.
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