Where does “neglectability” come from?

neglectability (English) comes from English ability, from Middle English abilite, from Old French ableté, from Latin habilitās, from Latin habilis, from Latin -ilis, from Proto-Italic -elis, from Proto-Indo-European -elis — Forms agent nouns from verbal roots.

Ancestry of “neglectability”, step by step

neglectability traces back through two separate lines of ancestry.

via English ability

StepLanguageWordMeaning
1EnglishabilitySuitableness; The quality or state of being able;...
2Middle Englishabilitesuitability, aptitude, ability
3Old Frenchableté
4Latinhabilitāsability, aptitude, fitness
5Latinhabilisable to have/possess/maintain; having sufficient...
6Latin-ilis-ile
7Proto-Italic-elis
8Proto-Indo-European-elis
9Proto-Indo-European-lósForms agent nouns from verbal roots

via English neglect

StepLanguageWordMeaning
1EnglishneglectTo fail to care for or attend to something; To...
2Latinneglectusdisregarded, having been disregarded, ignored,...
3LatinneglegoI neglect, overlook, pass over; I am indifferent...
4Latinneclego
5LatinlegoI choose, select, appoint; I collect, gather,...
6Latinlexa proposition or motion for a law made to the...
7Proto-Italiclēg-
8Proto-Indo-Europeanleǵ-s
9Proto-Indo-Europeanleǵ-to gather, collect, with derivatives meaning to...
Every word from Proto-Indo-European -lós