Antonyms of noun importance

1 of 2 senses of importance

Sense 1
importance -- (the quality of being important and worthy of note; "the importance of a well-balanced diet")
       Antonym of unimportance (Sense 2)
      => unimportance -- (the quality of not being important or worthy of note)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun importance

2 senses of importance

Sense 1
importance -- (the quality of being important and worthy of note; "the importance of a well-balanced diet")
       => value -- (the quality (positive or negative) that renders something desirable or valuable; "the Shakespearean Shylock is of dubious value in the modern world")

Sense 2
importance, grandness -- (a prominent status; "a person of importance")
       => standing -- (social or financial or professional status or reputation; "of equal standing"; "a member in good standing")