GUESSTIMATE
guesstimate, guestimate
(noun) an estimate that combines reasoning with guessing
guesstimate
(verb) estimate based on a calculation
Source: WordNet® 3.1
Etymology
Noun
guesstimate (plural guesstimates)
(informal) An estimate that is hardly any better than a guess, often because it is based on insufficient or unreliable data.
Verb
guesstimate (third-person singular simple present guesstimates, present participle guesstimating, simple past and past participle guesstimated)
(intransitive) To make a guesstimate.
(transitive) To make a guesstimate of a specific quantity.
Anagrams
• guestimates
Source: Wiktionary