Antonyms of adj eventful

2 senses of eventful

Sense 1
eventful (vs. uneventful) -- (full of events or incidents; "the most exhausting and eventful day of my life")

uneventful (vs. eventful) -- (marked by no noteworthy or significant events; "an uneventful life"; "the voyage was pleasant and uneventful"; "recovery was uneventful")

Sense 2
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 eventful

2 senses of eventful

Sense 1
eventful (vs. uneventful) -- (full of events or incidents; "the most exhausting and eventful day of my life")
       => lively -- (filled with events or activity; "a lively period in history")

Sense 2
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")