What does "guesstimate" mean?

An estimate that is hardly any better than a guess, often because it is based on insufficient or unreliable data.

How do you pronounce "guesstimate"?

Pronounced //ˈɡɛs.tə.mət//.

Common synonyms include: approximate, approximate solver, approximating, approximation, ballpark, ballpark figure.

/ˈɡɛs.tə.mət/ noun, verb, slang

noun, verb, slang ·Moderate ·High school level

Noun

1
An estimate that is hardly any better than a guess, often because it is based on insufficient or unreliable data. informal
"Near-synonym: educated guess"
2
an estimate that combines reasoning with guessing wordnet

Verb

"I guesstimate it'll take at least a week."

Blend of guess + estimate.