noun
stupidity; imbecility; dullness
Literary and somewhat archaic term for dullness or stupidity. Rare in everyday speech; more common in classical or formal written contexts.
彼は自らの魯鈍を恥じた。
He was ashamed of his own stupidity.
その批評は作品の魯鈍さを指摘している。
The critique points out the dullness of the work.