Breadcrumb Home > Thesaurus > G Synonyms of guesstimate Find synonyms for: Noun 1. guesstimate, guestimate, estimate, estimation, approximation, idea usage: an estimate that combines reasoning with guessing Verb 1. guesstimate, estimate, gauge, approximate, guess, judge usage: estimate based on a calculation WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of guesstimate (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: criticaster Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language