Antonyms of adj all-important

1 sense of all-important

Sense 1
all-important (prenominal), all important (predicate), crucial, essential, of the essence (predicate) -- (of the greatest importance; "the all-important subject of disarmament"; "crucial information"; "in chess cool nerves are of the essence")

INDIRECT (VIA important) -> unimportant -- (not important; "a relatively unimportant feature of the system"; "the question seems unimportant")
                                                                         

Similarity of adj all-important

1 sense of all-important

Sense 1
all-important (prenominal), all important (predicate), crucial, essential, of the essence (predicate) -- (of the greatest importance; "the all-important subject of disarmament"; "crucial information"; "in chess cool nerves are of the essence")
       => important (vs. unimportant), of import -- (of great significance or value; "important people"; "the important questions of the day")