/ Thesaurus / S Synonyms of sixties Find synonyms for: Noun1. sixties, 1960s, decade, decennary, decenniumusage: the decade from 1960 to 19692. sixties, mid-sixties, time of lifeusage: the time of life between 60 and 70Noun1. sixties, 1960s, decade, decennary, decenniumusage: the cardinal number that is the product of ten and sixWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: torrid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language