フランス語のnice, stupid, sillyから、ラテン語のnescius, ignorant, ne-, nothing, no, -sci, knowledge, knowing、語源は科学と同じ。sillyと比較する。
In many examples from the 16th and 17th centuries it is difficult to say in what particular sense the writer intended it to be taken. [OED]By 1926, it was pronounced "too great a favorite with the ladies, who have charmed out of it all its individuality and converted it into a mere diffuser of vague and mild agreeableness." [Fowler]
"I am sure," cried Catherine, "I did not mean to say anything wrong; but it is a nice book, and why should I not call it so?"
"Very true," said Henry, "and this is a very nice day, and we are taking a very nice walk; and you are two very nice young ladies. Oh! It is a very nice word indeed! It does for everything." [Jane Austen, "Northanger Abbey," 1803]