Difference between until and unless. Share with your friends Share 2 Nihar Naidu answered this until means "till that thing has not been done/reached" unless means "only when that thing is done" 2 View Full Answer Chaitanya Agarwal answered this They both mean the same I think so. 0 Daksha Rawat answered this unless -except for specified condition .antonym-if. until-up to time of (something happening) before(a time).antonym-since 0