Where does “unduty” come from?

unduty (English) comes from English duty, from Middle English duete, from Middle English dewe, from Old French deü, from Latin dēbēre, from Latin dē, from Latin post, from Latin poste — afterwards, post; by, at.

Ancestry of “unduty”, step by step

unduty traces back through two separate lines of ancestry.

via English duty

StepLanguageWordMeaning
1EnglishdutyThat which one is morally or legally obligated to...
2Middle EnglishdueteA charge, fee, or tax; a monetary sum one is owed...
3Middle EnglishdeweAlternative form of dew; Alternative form of...
4Old FrenchdeüAlternative form of deu
5Latindēbēre
6Latinof; concerning; about
7Latinpostbehind; after, since, besides, except; behind,...
8Latinposteablative singular of postis
9Proto-Italicpostibehind, after
10Proto-Indo-Europeanpóstiafter
11Proto-Indo-Europeanpósafterwards, post; by, at

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Proto-Indo-European pós