na-adjective, noun which may take the genitive case particle 'no', noun
Describes something that feels unnatural, out of place, or different from the norm in a way that draws attention. Often used for behavior, remarks, or situations that seem unusual or unsettling.
彼の奇異な行動に周囲は戸惑った。
People around him were puzzled by his strange behavior.
その提案は奇異に感じられた。
The proposal struck me as odd.
Compound of 奇 (ki, 'strange, unusual') and 異 (i, 'different, unusual'). The combination reinforces the sense of something being out of the ordinary.