Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class V. Words Releasing to the Voluntary Powers
Division (II) Intersocial Volition
Section III. Conditional Intersocial Volition

773. Nonobservance.

   NOUN:NONOBSERVANCE [See Observance]; evasion, inobservance, failure, omission, neglect, laches [law], casualness, slackness, laxness, laxity, informality.
  lawlessness; disobedience [See Disobedience]; bad faith [See Improbity].
  INFRINGEMENT, infraction; violation, transgression; piracy.
  RETRACTATION, repudiation, nullification; protest; forfeiture.
   VERB:EVADE, fail, neglect, omit, elude, give the go-by to [slang], cut [colloq.], set aside, ignore; shut -, close- one’s eyes to.
  INFRINGE, transgress, violate, pirate, break, trample under foot, do violence to, drive a coach and four (or six) through.
  DISCARD, protest, repudiate, fling to the winds, set at naught, nullify, declare null and void; cancel (wipe off) [See Obliteration].
  RETRACT, go back from, be off, forfeit, go from one’s word, palter; stretch a point, strain a point.
   ADJECTIVE:VIOLATING &c. v.; lawless, transgressive; elusive, evasive, slack, lax, casual, slippery; nonobservant.
  unfilfilled &c. (see fulfill [See Observance]).