Where does “ความไว้วางใจ” come from?

ความไว้วางใจ (Thai) comes from Thai ไว้วางใจ, from Thai ไว้, from Proto-Southwestern Tai waj/aɰᶜ² — to keep.

Ancestry of “ความไว้วางใจ”, step by step

ความไว้วางใจ traces back through two separate lines of ancestry.

via Thai ไว้วางใจ

StepLanguageWordMeaning
1Thaiไว้วางใจto have faith and trust (in); to confide (in)
2Thaiไว้to place; to locate; to keep; to hold; to...
3Proto-Southwestern Taiwaj/aɰᶜ²to keep

via Thai ความ

StepLanguageWordMeaning
1Thaiความaffair; matter; content; essence; subject;...
2Proto-Taiɣwaːmᴬmatter
Every word from Proto-Southwestern Tai waj/aɰᶜ²Every word from Thai ไว้Every word from Thai ไว้วางใจ