最佳解答: Hi, 言言
Person is a noun and least is an adverb. An adverb is used to modify an adjective, a verb and another adverb, while an adjective is used to modify a noun. Argument is a noun not an adjective.
You are the least captious person that I have ever seen.
You are the least caviling person that I have ever seen.
You are the least contentious person that I have ever seen.