Where does “squirreliness” come from?

squirreliness (English) comes from English squirrely, from English squirrel, from Middle English squirel, from Old French escurel, from Vulgar Latin scuriolus, from Latin scūrius, from Latin sciūrus, from Ancient Greek σκίουρος — darkness, shadow.

Ancestry of “squirreliness”, step by step

StepLanguageWordMeaning
1EnglishsquirrelyAlternative form of squirrelly
2EnglishsquirrelAny of the rodents of the family Sciuridae...
3Middle EnglishsquirelA squirrel; A squirrel fur or hide
4Old Frenchescurelsquirrel
5Vulgar Latinscuriolus
6Latinscūrius
7Latinsciūrussquirrel
8Ancient Greekσκίουροςsquirrel
9Ancient Greekσκιάshadow; shade
10Proto-Indo-European(s)ḱeh₃ih₂shadow, shade
11Proto-Indo-European(s)ḱeh₃-darkness, shadow
Every word from Proto-Indo-European (s)ḱeh₃-Every word from Proto-Indo-European (s)ḱeh₃ih₂Every word from Ancient Greek σκιά