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Webster 1913 Edition
Improbity
Im-prob′i-ty
,Noun.
 [L. 
improbitas
; pref. im- 
not + probitas 
probity: cf. F. improbité
.] Lack of probity; lack of integrity or rectitude; dishonesty. 
Webster 1828 Edition
Improbity
IMPROB'ITY
,Noun.