Breadcrumb Home > Thesaurus > S Synonyms of sinclair Find synonyms for: Noun 1. Sinclair, Upton Sinclair, Upton Beall Sinclair usage: United States writer whose novels argued for social reform (1878-1968) 2. Sinclair, Clive Sinclair, Sir Clive Marles Sinclair usage: English electrical engineer who founded a company that introduced many innovative products (born in 1940) WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of sinclair (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: pyknic Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language