inobservance
/ˌɪnəbˈzɜːvəns/noun
mass noun
1- dated failure to observe or notice; inattention〈旧〉忽视; 疏忽。
1.1
- failure to keep or observe a law, custom, promise, etc（对法律、习俗、诺言等的）违犯, 违反, 不遵守。
词源
early 17th cent.: from French, or from Latin inobservantia, from in- (expressing negation) + observantia 'observance' （from observare 'observe'）.