/ Thesaurus / U Synonyms of up in the air Find synonyms for: Adjective1. up in the air, uncertain (vs. certain)usage: very uncertain; "left everything up in the air"2. up in the air, uncertain (vs. certain)usage: not yet determined; "plans are still up in the air"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language