The meaning of insincere words in emotions is: the words are not said from the heart, that is, what is said is not true, which means that the heart and the mouth are inconsistent. "To speak insincerely" is a Chinese idiom, whose pinyin is yánbùyóuzhōng.

Speaking without sincerity comes from "Zuo Zhuan·Yin Gong Three Years": "Belief cannot be trusted, and quality is of no use." Yang Bojun noted: "People's words are believed to be true, and they are of the same mind."

Other meanings of insincere words: out of desperation, he had no choice but to say a few complimentary words insincerely. I think you fell in love with Mr. Wang, so you pretended to criticize him insincerely.