na-adjective, noun which may take the genitive case particle 'no', noun
Describes something that happens outside of one's expectations or plans; often used in formal or written contexts.
Everyone was surprised by the unexpected event.
Refers to behavior or speech that is discourteous or lacking in consideration; somewhat old-fashioned and formal.
I was offended by his rude attitude.
rude person; insolent person
Compound of 慮 (consideration, thought) and 外 (outside). The exact historical derivation is uncertain, but the word conveys something beyond what was considered or proper.