Breadcrumb Home > Thesaurus > O Synonyms of overreckoning Find synonyms for: Noun1. overestimate, overestimation, overrating, overreckoning, estimate, estimation, approximation, ideausage: a calculation that results in an estimate that is too highWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. ✖ Related Content Daily Word Quiz: hortatory Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language