Where does “unidiomaticness” come from?

unidiomaticness (English) comes from English unidiomatic, from English idiomatically, from English -ally, from English ahistoric, from English historic, from Latin historicus, from Latin historia, from Ancient Greek ἱστορία.

Ancestry of “unidiomaticness”, step by step

unidiomaticness traces back through two separate lines of ancestry.

via English unidiomatic

StepLanguageWordMeaning
1EnglishunidiomaticNot idiomatic
2EnglishidiomaticallyIn an idiomatic manner
3English-allyused with adjectives ending in -ic
4EnglishahistoricSynonym of ahistorical
5EnglishhistoricVery important; noteworthy: having importance or...
6Latinhistoricushistorical
7Latinhistoriahistory; account; story
8Ancient Greekἱστορίαinquiry, examination, systematic observation,...
9Ancient Greekἱστορέωto inquire, ask; to examine, observe; to record,...
10Ancient Greekἵστωρone who knows law and right, judge; witness; a...
11Proto-Hellenicwístōr
12Proto-Indo-Europeanwéydtōrone who has seen, one who knows
13Indo-European*weyd-

via English Ness

StepLanguageWordMeaning
1EnglishNessAn Ulster princess and the mother of Conchobar mac Nessa and Findchoem in the Ulster Cycle of Irish mythology. Daughter of Eochaid Sálbuide. Also the mother of Cormac Cond Longas by incest with Conchobar mac Nessa
2Middle Englishnesse
3Old Englishnæsnot, not at all; not; first/third-person singular...
4Proto-Germanicnasjąfoothill; headland; cape
5Proto-Indo-Europeannéh₂snose
Every word from Indo-European *weyd-Every word from English -allyEvery word from Proto-Indo-European wéydtōr