Where does “undeclinably” come from?

undeclinably (English) comes from English undeclinable, from English declinable, from English decline, from Old French decliner, from Latin dēclīnō, from Latin dē-, from Latin dē, from Latin post — afterwards, post; by, at.

Ancestry of “undeclinably”, step by step

undeclinably traces back through two separate lines of ancestry.

via English undeclinable

StepLanguageWordMeaning
1EnglishundeclinableSynonym of indeclinable
2EnglishdeclinableCapable of being declined
3EnglishdeclineDownward movement, fall; A sloping downward, e.g....
4Old Frenchdecliner
5Latindēclīnōto bend, deviate, turn aside/away, deflect
6Latindē-of; from
7Latinof; concerning; about
8Latinpostbehind; after, since, besides, except; behind,...
9Latinposteablative singular of postis
10Proto-Italicpostibehind, after
11Proto-Indo-Europeanpóstiafter
12Proto-Indo-Europeanpósafterwards, post; by, at

via English ly

StepLanguageWordMeaning
1EnglishlyAbbreviation of light-year
2VietnameselyAlternative spelling of li
Every word from Proto-Indo-European pós
undeclinably — Etymology, Origin & Word History | Etymology Explorer