This is the 14836th most frequent Russian word.
поверил
"Поверил" means "believed" or "trusted" in English.
The word 'поверил' is used here in the sense of trusting someone's words as truthful.
Я поверил ему, когда он сказал, что всё будет хорошо.
I believed him when he said that everything would be fine.
In this instance, 'поверил' expresses disbelief or amazement at something seen.
Он не поверил своим глазам, увидев такой красивый рассвет.
He couldn't believe his eyes when he saw such a beautiful sunrise.
Here, 'поверила' signifies having faith in someone's abilities or potential.