1590s, probably a back-formation from grandiloquence. Related: Grandiloquently.
实用例句
1. She attacked her colleagues for indulging in "grandiose and grandiloquent language".
她抨击同事“言辞浮夸做作”。来自柯林斯例句
2. Indeed, no eulogy could be more grandiloquent than this.
真是恭维备至.来自《现代英汉综合大词典》
3. For years, from newspapers, broadcasts, the stages and at meetings , we had heard nothing but grandiloquent rhetoric delivered with shouts and shrieks that deafened the ears.