Where does “đáng kiếp” come from?

đáng kiếp (Vietnamese) comes from Vietnamese đáng, from Proto-Vietic taŋʔ, from Proto-Mon-Khmer kt₂aŋ — bitter.

Ancestry of “đáng kiếp”, step by step

đáng kiếp traces back through two separate lines of ancestry.

via Vietnamese đáng

StepLanguageWordMeaning
1Vietnameseđángworthy, worth; to deserve, to merit
2Proto-Vietictaŋʔbitter
3Proto-Mon-Khmerkt₂aŋbitter

via Vietnamese kiếp

StepLanguageWordMeaning
1Vietnamesekiếpa life; an incarnation
Every word from Proto-Mon-Khmer kt₂aŋ →Every word from Proto-Vietic taŋʔ →Every word from Vietnamese đáng →