Where does “ความสงสัย” come from?

ความสงสัย (Thai) comes from Thai สงสัย, from Pali saṃsaya, from Sanskrit संशय — doubt; uncertainty; irresolution; hesitation.

Ancestry of “ความสงสัย”, step by step

ความสงสัย traces back through two separate lines of ancestry.

via Thai สงสัย

StepLanguageWordMeaning
1Thaiสงสัยto wonder; to doubt; to suspect
2Palisaṃsayadoubt
3Sanskritसंशयdoubt; uncertainty; irresolution; hesitation

via Thai ความ

StepLanguageWordMeaning
1Thaiความaffair; matter; content; essence; subject;...
2Proto-Taiɣwaːmᴬmatter
Every word from Sanskrit संशय →Every word from Pali saṃsaya →Every word from Thai สงสัย →