köken: 진(眞) (jin, “truth”) + -짜 (-jja) of unclear origin, perhaps nativisation of 자(字) (ja, “character”, Sino-Korean) or a compound -ㅅ- (-s-) + 자(字) (ja). Presumably replaced Middle Korean 진딧 (cintis), from the same Chinese etymon and with the same meaning.
Used other than figuratively or idiomatically: see ei, kai. "probably not", "I guess not" · not even (used to express strong disbelief, disappointment or disapproval) · duh, no duh
Kuulin, että tämän iltainen esitys haluttiin peruuttaa. -- Ei kai!