This is the 706th most frequent Hebrew word.
רע
"רע" in Hebrew means "bad," "evil," or "friend," depending on context.
In this sentence, 'רע' means 'companion' or 'friend'.
חבר שלי הוא רע טוב מאוד.
My friend is a very good companion.
Here, 'רע' is used as an adjective meaning 'bad' or 'negative' to describe the habit.
יש לו מנהג רע לעשן בבית.
He has a bad habit of smoking indoors.
In this context, 'רע' is used as an adjective meaning 'bad' or 'disturbing'.