Where does “ความไว” come from?

ความไว (Thai) comes from Thai ความ, from Proto-Tai ɣwaːmᴬ — matter.

Ancestry of “ความไว”, step by step

ความไว traces back through two separate lines of ancestry.

via Thai ความ

StepLanguageWordMeaning
1Thaiความaffair; matter; content; essence; subject;...
2Proto-Taiɣwaːmᴬmatter

via Thai ไว

StepLanguageWordMeaning
1Thaiไวquickly; to be fast, quick
Every word from Proto-Tai ɣwaːmᴬEvery word from Thai ความ