/ Thesaurus / U Synonyms of unleaded gasoline Find synonyms for: Noun1. unleaded gasoline, unleaded petrol, gasoline, gasolene, gas, petrolusage: gasoline that has not been treated with a lead compoundWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language