1) Absence or lack of observance 2) Evasion 3) Failure 4) Informality 5) Inobservance 6) Laches 7) Laxity 8) Neglect 9) Nonconformity 10) Omission 1) Disobedience 2) Inattention 
• (n.) Neglect or failure to observe or fulfill. • (n.) Neglect or failure to observe or fulfill.
Non`ob·serv'ance noun Neglect or failure to observe or fulfill. 
[n] - a lack of conformity with law or custom or practice etc.
noun a lack of conformity with law or custom or practice etc.
absence or lack of observance.