His oratorical skills were impressive, full of persuasion and formal style.

oratorical 是由名词 orator（演说家）加上形容词后缀 -ical 构成的形容词。orator 源自拉丁语，意思是"演讲者"。oratorical 表示"演讲的、雄辩的"，形容具有正式演讲风格和说服力的表达方式。