unimportance
noun/ˌʌnɪmˈpɔːtns/
/ˌʌnɪmˈpɔːrtns/
[uncountable]- the fact of not being important
- the relative unimportance of labour-intensive manufacturing industries in the new economy
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unimportance
Definition of unimportance noun from the Oxford Advanced Learner's Dictionary