Where does “unlikableness” come from?

unlikableness (English) comes from English unlikable, from English likable, from English like, from Dutch luik, from Middle Dutch luke, from Dutch luiken, from Middle Dutch luken, from Old Dutch lūcan — to break, tear; to break, shatter.

Ancestry of “unlikableness”, step by step

unlikableness traces back through two separate lines of ancestry.

via English unlikable

StepLanguageWordMeaning
1EnglishunlikableNot likable
2EnglishlikableCapable of being liked; Having qualities tending...
3EnglishlikeTo enjoy, be pleased by; favor; be in favor of;...
4Dutchluikhatch; shutter; panel, as in a triptych
5Middle Dutchluke
6Dutchluikento close, to shut
7Middle Dutchlukento close, to shut; to close, to become closed
8Old Dutchlūcanto close, shut
9Proto-West Germaniclūkanto close, to shut
10Proto-Germaniclūkanąto close, to shut; Alternative form of *leukaną
11Proto-Indo-Europeanlewǵ-to break, tear; to break, shatter

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 Proto-Indo-European lewǵ-Every word from Proto-Germanic lūkanąEvery word from Proto-West Germanic lūkan