Antonyms of noun essentiality

1 sense of essentiality

Sense 1
essentiality, essentialness -- (basic importance)
       Antonym of inessentiality (Sense 1)
      => inessentiality -- (not of basic importance)

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

1 sense of essentiality

Sense 1
essentiality, essentialness -- (basic importance)
       => importance -- (the quality of being important and worthy of note; "the importance of a well-balanced diet")