Where does “ความหัวร้อน” come from?

ความหัวร้อน (Thai) comes from Thai หัวร้อน, from English hothead, from English head, from English -y, from Middle English -y, from Old English -iġ, from Proto-West Germanic -g, from Proto-Germanic -gaz — -y, -ic.

Ancestry of “ความหัวร้อน”, step by step

ความหัวร้อน traces back through two separate lines of ancestry.

via Thai หัวร้อน

StepLanguageWordMeaning
1Thaiหัวร้อนirascible
2EnglishhotheadOne who angers easily or goes in search of...
3EnglishheadThe part of the body of an animal or human which...
4English-yAdded to nouns and adjectives to form adjectives...
5Middle English-yDesignates an adjective, in many cases formed by...
6Old English-iġ-y, -ic
7Proto-West Germanic-gForms adjectives from nouns and verbs with a...
8Proto-Germanic-gaz-y
9Proto-Indo-European-ḱos-y, -ic

via Thai ความ

StepLanguageWordMeaning
1Thaiความaffair; matter; content; essence; subject;...
2Proto-Taiɣwaːmᴬmatter
Every word from Proto-Indo-European -ḱosEvery word from English -yEvery word from Old English -iġ