Antonyms of adj consequential

1 sense of consequential

Sense 1
consequential, eventful -- (having important issues or results; "the year's only really consequential legislation"; "an eventful decision")

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

Similarity of adj consequential

1 sense of consequential

Sense 1
consequential, eventful -- (having important issues or results; "the year's only really consequential legislation"; "an eventful decision")
       => important (vs. unimportant), of import -- (of great significance or value; "important people"; "the important questions of the day")

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