“无诚意”的英语可以翻译为：insincerity，inveracity ...

空洞的诺言是无诚意的.An empty promise is insincere.约翰无诚意地赞美海伦之新发型.John paid lip service to Helen's new hairstyle.更有甚者,他似乎并无诚意, 事实上, 他的笑容也显得虚伪.More than that he seems disingenuous; in fact, his smile looks phony too....