Breadcrumb Home > Thesaurus > I Synonyms of inertia Find synonyms for: Noun 1. inactiveness, inactivity, inertia, trait usage: a disposition to remain inactive or inert; "he had to overcome his inertia and get back to work" 2. inertia, mechanical phenomenon usage: (physics) the tendency of a body to maintain its state of rest or uniform motion unless acted upon by an external force WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of inertia (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: procellous Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language