up in the air. adjective. These are words and phrases related to up in the air. Click on any word or phrase to go to its thesaurus page. Or, go to the definition of up in the air. On this page you'll find 27 synonyms, antonyms, and words related to up in the air, such as: chancy, debatable, doubtful, iffy, pending, and questionable. antonyms for up in the air Most relevant .

up in the air synonym