Where does “nonridiculous” come from?

nonridiculous (English) comes from English ridiculous, from Latin rīdiculus, 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 “nonridiculous”, step by step

nonridiculous traces back through two separate lines of ancestry.

via English ridiculous

StepLanguageWordMeaning
1EnglishridiculousDeserving of ridicule; foolish; absurd;...
2Latinrīdiculus(good, in the context of humor) laughable, funny, amusing, humorous
3Latin-ulusUsed to form a diminutive of a noun, indicating...
4Proto-Italic-olos
5Proto-Italic-elosForms desubstantival and deadjectival diminutive nouns
6Proto-Indo-European-e-lós
7Proto-Indo-European-lósForms agent nouns from verbal roots

via English non

StepLanguageWordMeaning
1EnglishnonObsolete form of none
2Frenchnonno; not; a no, a negative response
3Old Frenchnonno; not; Alternative form of nom
4Latinnōnnot
5Old Latinnoenum
6Proto-Indo-Europeanóynosone; single
Every word from Proto-Indo-European -lósEvery word from Latin -ulusEvery word from Latin rīdiculus