ei kai

Finnish

Used other than figuratively or idiomatically: see ei,‎ kai. "probably not", "I guess not"
(colloquial) not even (used to express strong disbelief, disappointment or disapproval)
Synonyms: ei ole totta, eikä

Kuulin, että tämän iltainen esitys haluttiin peruuttaa. -- Ei kai!
I heard they wanted to cancel the show tonight. -- Not even!
(colloquial, sarcastic) duh, no duh
Alternative form: no ei kai
(colloquial) don't tell me
Ei kai tänään ole maanantai.
Don't tell me today is Monday.

The meaning depends on the tone of voice.