Where does “การเพ้อเจ้อ” come from?

การเพ้อเจ้อ (Thai) comes from Thai การ, from Pali kāra, from Sanskrit कार, from Sanskrit कृ, from Proto-Indo-European kʷer- — to do; to make; to build.

Ancestry of “การเพ้อเจ้อ”, step by step

การเพ้อเจ้อ traces back through two separate lines of ancestry.

via Thai การ

Step	Language	Word	Meaning
1	Thai	การ	work; matter; task; affair; prefixed to nouns to...
2	Pali	kāra	deed; doing, manner; production, application
3	Sanskrit	कार	gain, prize, booty; contest, war; an act, action
4	Sanskrit	कृ	to make
5	Proto-Indo-European	kʷer-	to do; to make; to build

via Thai เพ้อเจ้อ

Step	Language	Word	Meaning
1	Thai	เพ้อเจ้อ	to talk nonsense; to drivel; to babble; to blather
2	Thai	เพ้อ	to be delirious

Every word from Proto-Indo-European kʷer- →Every word from Sanskrit कृ →Every word from Sanskrit कार →