Antonyms of adj up_in_the_air

2 senses of up in the air

Sense 1
up in the air -- (very uncertain; "left everything up in the air")

INDIRECT (VIA uncertain) -> certain -- (established beyond doubt or question; definitely known; "what is certain is that every effect must have a cause"; "it is certain that they were on the bus"; "his fate is certain"; "the date for the invasion is certain")

Sense 2
up in the air -- (not yet determined; "plans are still up in the air")

INDIRECT (VIA uncertain) -> certain, sure -- (certain to occur; destined or inevitable; "he was certain to fail"; "his fate is certain"; "In this life nothing is certain but death and taxes"- Benjamin Franklin; "he faced certain death"; "sudden but sure regret"; "he is sure to win")

Similarity of adj up_in_the_air

2 senses of up in the air

Sense 1
up in the air -- (very uncertain; "left everything up in the air")
       => uncertain (vs. certain) -- (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")

Sense 2
up in the air -- (not yet determined; "plans are still up in the air")
       => uncertain (vs. certain) -- (not certain to occur; not inevitable; "everything is uncertain about the army"; "the issue is uncertain")