Where does “ความเถรตรง” come from?

ความเถรตรง (Thai) comes from Thai เถรตรง, from Thai ตรง, from Old Khmer ត្រង — to be straight, direct, or upright.

Ancestry of “ความเถรตรง”, step by step

ความเถรตรง traces back through two separate lines of ancestry.

via Thai เถรตรง

StepLanguageWordMeaning
1Thaiเถรตรงcandid, blunt, too straightforward, too honest; unrigid, unyielding, inflexible, stiff
2Thaiตรงstraight; not bent; honest; at
3Old Khmerត្រងto be straight, direct, or upright

via Thai ความ

StepLanguageWordMeaning
1Thaiความaffair; matter; content; essence; subject;...
2Proto-Taiɣwaːmᴬmatter
Every word from Old Khmer ត្រង →Every word from Thai ตรง →Every word from Thai เถรตรง →