This is the 178th most frequent Czech word.
nikdy
The Czech word "nikdy" means "never" in English.
'Nikdy' in this sentence indicates a negation of ever experiencing an event, emphasizing that the speaker has not been to a place at any time in the past.
Nikdy jsem tam nebyl.
I have never been there.
'Nikdy' is used emphatically and repetitively here to highlight the avoidance of dismissing possibilities entirely, forming a proverbial statement.
Nikdy neříkej nikdy.
Never say never.
'Nikdy' conveys a negative certainty regarding the completion of a future action by the subject.