This is the 146th most frequent Armenian word.
չէր
"չէր" means "was not" in English.
The word "չէր" is used here to form the past negative of the verb "recall."
Նա դպրոցի ճանապարհը մտաբերում չէր։
He couldn't recall the way to school.
The word "չէր" is part of the phrase "was not sure" indicating a negation in past tense.
Ես վստահ չէի՝ արդյոք նա կգա։
I was not sure whether he would come.
The word "չէր" indicates that the action of finishing was negated.