This is the 2515th most frequent Russian word.
проявил
"Проявил" means "displayed," "showed," or "demonstrated."
In this sentence, "проявил" is used to mean "displayed" or "demonstrated" as he showed kindness toward the guests.
Он проявил доброе отношение к гостям.
He displayed a kind attitude towards the guests.
Here, "проявила" is applied in the reflexive form, referring to showing one's qualities or abilities.
Она проявила себя как отличный лидер в трудной ситуации.
She demonstrated herself as an excellent leader in a difficult situation.
In this example, "проявил" means "exhibited" or "showed," indicating the act of demonstrating a quality, such as patience.