Definition of improbity in English:
 improbity
noun ɪmˈprɒbɪtiɪmˈprəʊbɪtiɪmˈproʊbədi
mass nounformal Lack of honesty and moral integrity.
 Example sentencesExamples
-  It is the keenest spur to exertion and the surest of all guards against improbity.
 -  ‘She does not accept red envelopes or construction kickbacks, indeed, never commits any form of improbity,’ he said.
 -  The ruling party has distorted the history of the liberation struggle in this country beyond fiction, bigotry and improbity.
 
Origin
  
Late 16th century: from Latin improbitas, from improbus 'wicked', from in- 'not' + probus 'good'. Compare with probity.
   Definition of improbity in US English:
 improbity
nounɪmˈproʊbədiimˈprōbədē
formal Lack of honesty and moral integrity.
 Example sentencesExamples
-  ‘She does not accept red envelopes or construction kickbacks, indeed, never commits any form of improbity,’ he said.
 -  The ruling party has distorted the history of the liberation struggle in this country beyond fiction, bigotry and improbity.
 -  It is the keenest spur to exertion and the surest of all guards against improbity.
 
Origin
  
Late 16th century: from Latin improbitas, from improbus ‘wicked’, from in- ‘not’ + probus ‘good’. Compare with probity.