Where does “ungainsome” come from?

ungainsome (English) comes from English gainsome, from English gain, from Middle French gain, from Old French gaaing, from Old French gaaignier, from Vulgar Latin *wadaniāre, from English unspecified, from English Un- — not.

Ancestry of “ungainsome”, step by step

ungainsome traces back through two separate lines of ancestry.

via English gainsome

StepLanguageWordMeaning
1EnglishgainsomeMarked by gain; gainful; profitable; Well-formed;...
2EnglishgainTo acquire possession of; To have or receive...
3Middle Frenchgainincome
4Old Frenchgaainggain
5Old FrenchgaaignierAlternative form of gaigner; to earn, gain,...
6Vulgar Latin*wadaniāre
7EnglishunspecifiedNot specified; not thoroughly explained or...
8EnglishUn-not
9Middle Englishun-
10Old Englishun-negation or absence of: un-, non-; bad; forms...
11Proto-West Germanicun-not, un-
12Proto-Germanicun-not, un-
13Proto-Indo-Europeann̥-not, un-
14Proto-Indo-Europeannenot

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Proto-Indo-European neEvery word from English Un-Every word from Proto-Indo-European n̥-