Where does “ความเวทนา” come from?

ความเวทนา (Thai) comes from Thai เวทนา, from Pali vedanā, from Sanskrit वेदना, from Sanskrit वदन, from Sanskrit -अन, from Proto-Indo-European -nós — Creates verbal adjectives from roots.

Ancestry of “ความเวทนา”, step by step

ความเวทนา traces back through two separate lines of ancestry.

via Thai เวทนา

StepLanguageWordMeaning
1Thaiเวทนาfeeling, sensation, or emotion, being one of the five ขันธ์ that constitute a sentient being; the other four being รูป, สัญญา, สังขาร, and วิญญาณ
2Palivedanāperception, feeling, sensation
3Sanskritवेदनाpain, agony
4Sanskritवदनmouth, face; speaking, saying
5Sanskrit-अनforms neuter nouns
6Proto-Indo-European-nósCreates verbal adjectives from roots

via Thai ความ

StepLanguageWordMeaning
1Thaiความaffair; matter; content; essence; subject;...
2Proto-Taiɣwaːmᴬmatter
Every word from Proto-Indo-European -nósEvery word from Sanskrit -अनEvery word from Sanskrit वदन