Definition of inobservance in US English:

inobservance

noun

archaic
  • 1Failure to observe or notice; inattention.

    1. 1.1 Failure to keep or observe a law, custom, promise, etc.

Origin

Early 17th century: from French, or from Latin inobservantia, from in- (expressing negation) + observantia ‘observance’ (from observare ‘observe’).

Pronunciation

inobservance

/ˌinəbˈzərvəns//ˌɪnəbˈzərvəns/