Where does “unexplicably” come from?

unexplicably (English) comes from English unexplicable, from English inexplicable, from Middle English inexplicable, from Middle French inexplicable, from Latin inexplicabilis, from Latin explicabilis, from Latin -bilis, from Proto-Italic -ðlis — Alternative form of *-trom; instrumental suffix;...

Ancestry of “unexplicably”, step by step

unexplicably traces back through two separate lines of ancestry.

via English unexplicable

StepLanguageWordMeaning
1Englishunexplicable
2EnglishinexplicableImpossible to explain; not easily accounted for
3Middle Englishinexplicable
4Middle Frenchinexplicable
5Latininexplicabilisinexplicable
6Latinexplicabilisthat may be explained, explicable, explainable
7Latin-bilis-ble
8Proto-Italic-ðlisForms adjectives from verb stems indicating capacity or worth of being acted on
9Proto-Indo-European-dʰlis
10Proto-Indo-European-dʰlomAlternative form of *-trom; instrumental suffix;...

via English ly

StepLanguageWordMeaning
1EnglishlyAbbreviation of light-year
2VietnameselyAlternative spelling of li
Every word from Proto-Indo-European -dʰlomEvery word from Latin -bilisEvery word from Latin explicabilis