This is the 676th most frequent Armenian word.
չկան
"Չկան" means "are not" or "do not exist" in English.
In this sentence, 'չկան' is used to indicate the absence of something (clouds) in a given location (the sky).
Ամպերը երկնքում չկան։
There are no clouds in the sky.
Here, 'չկան' is utilized to express the non-existence of definitive answers beforehand.
Երկվում առաջ չկան վերջնական պատասխաններ։
There are no definitive answers in advance.
In this usage, 'չկան' demonstrates negation of the existence of a certain kind of people (those who never err).