up in the air

adjectives

very uncertain
"left everything up in the air"
up in the air
is similar to
not established beyond doubt; still undecided or unknown
"an uncertain future"; "a manuscript of uncertain origin"; "plans are still uncertain"; "changes of great if uncertain consequences"; "without further evidence his story must remain uncertain"
uncertain
not yet determined
"plans are still up in the air"
up in the air
is similar to
not certain to occur; not inevitable
"everything is uncertain about the army"; "the issue is uncertain"
uncertain