Where does “stick-at-itiveness” come from?

stick-at-itiveness (English) comes from English IT, from Middle English it, from Old English hit, from Proto-Germanic hit, from Proto-Indo-European ḱe- — demonstrative particle; here; this, here.

Ancestry of “stick-at-itiveness”, step by step

stick-at-itiveness traces back through two separate lines of ancestry.

via English IT

StepLanguageWordMeaning
1EnglishITInitialism of information technology; Initialism...
2Middle EnglishitAlternative form of hit
3Old Englishhitit
4Proto-Germanichitnominative/accusative singular neuter of *hiz
5Proto-Indo-Europeanḱe-demonstrative particle; here; this, here

via English stick at

StepLanguageWordMeaning
1Englishstick atTo continue practising (a skill), even it is difficult
Every word from Proto-Indo-European ḱe-Every word from Proto-Germanic hitEvery word from Old English hit