inobservance
/ɪnəbˈzəːv(ə)ns
/noun [mass noun] archaic
1Failure to observe or notice; inattention.
1.1Failure to observe a law, custom, etc.
Origin
Early 17th century: from French, or from Latin inobservantia, from in- (expressing negation) + observantia 'observance' (from observare 'observe').