Where does “scruplest” come from?

scruplest (English) comes from English scruple, from Old French scrupule, from Latin scrūpulus, from Latin -ulus, from Proto-Italic -olos, from Proto-Italic -elos, from Proto-Indo-European -e-lós, from Proto-Indo-European -lós — Forms agent nouns from verbal roots.

Ancestry of “scruplest”, step by step

scruplest traces back through two separate lines of ancestry.

via English scruple

StepLanguageWordMeaning
1EnglishscrupleA weight of 1⁄288 of a pound, that is, twenty...
2Old Frenchscrupule
3Latinscrūpulusa small, sharp or pointed stone
4Latin-ulusUsed to form a diminutive of a noun, indicating...
5Proto-Italic-olos
6Proto-Italic-elosForms desubstantival and deadjectival diminutive nouns
7Proto-Indo-European-e-lós
8Proto-Indo-European-lósForms agent nouns from verbal roots

via English Est

StepLanguageWordMeaning
1EnglishEstestablished
2Middle Englishestegrace, est, favour; pleasure, enjoyment, fun;...
3Old Englishēstwill, consent, favour, grace, liberality,...
4Proto-West Germanic*anstifavour
5Proto-Germanicanstizfavour, affection
6Proto-Germanicunnanąto grant, bestow
7Proto-Indo-Europeanān-to notice; face, mouth
Every word from Proto-Indo-European -lósEvery word from Latin -ulusEvery word from Latin scrūpulus