The term 'up in the air' is used to describe something that is UNCERTAIN, ambiguous, or unresolved. The crossword solutions for this term include IFFY (4 letters), ALOFT (5 letters), HIGH (4 letters), ABOVE (5 letters), UNSET (5 letters), ONHIGH (6 letters), INDOUBT (7 letters), LEAPING (7 letters), AVIATING (8 letters), ETHEREAL (8 letters), ONSTILTS (8 letters), UNPROVEN (8 letters), UNCERTAIN (9 letters), and UNSETTLED (9 letters). All of these words can be used to describe something that is not firmly established or is in a state of flux.