Where does “ความแข็ง” come from?

ความแข็ง (Thai) comes from Thai แข็ง, from Proto-Southwestern Tai *kʰɛːŋᴬ¹, from Proto-Tai *k.reːŋᴬ.

ความแข็ง (Thai): hardness; rigidness

Definitions

  1. hardness; rigidness

Ancestry of “ความแข็ง”, step by step

ความแข็ง traces back through two separate lines of ancestry.

via Thai แข็ง

StepLanguageWordMeaning
1Thaiแข็งhard; rigid
2Proto-Southwestern Tai*kʰɛːŋᴬ¹—
3Proto-Tai*k.reːŋᴬ—

via Thai ความ

StepLanguageWordMeaning
1Thaiความaffair; matter; content; essence; subject;...
2Proto-Taiɣwaːmᴬmatter
Every word from Proto-Tai *k.reːŋᴬ →Every word from Proto-Southwestern Tai *kʰɛːŋᴬ¹ →Every word from Thai แข็ง →