This is the 18609th most frequent Korean word.
식이었다
"식이었다" means "was a style/method/form."
식이었다 is describing the characteristic manner of her speech.
그녀의 말은 항상 충고하는 식이었다.
Her words were always in a suggestive manner.
식이었다 is used to classify the nature or type of his actions.
그의 행동은 정말 우스운 식이었다.
His action was really of a humorous sort.
식이었다 here refers to their method or approach.