不 自 然(ふしぜん)な

ふしぜんな

na-adjective

unnatural; artificial; forced

1. unnatural; artificial; forced; contrived

Not natural in appearance, behavior, or feeling. Describes something that seems awkward, forced, or inconsistent with what would be expected.

彼(かれ)の笑顔(えがお)は不自然(ふしぜん)だった。

His smile was unnatural.

この写真(しゃしん)はポーズが不自然(ふしぜん)に見(み)える。

The pose in this photo looks unnatural.

翻訳(ほんやく)ソフトの日本語(にほんご)は文法的(ぶんぽうてき)には正(ただ)しくても、不自然(ふしぜん)な表現(ひょうげん)が多(おお)い。

The Japanese from translation software often contains unnatural expressions, even if it is grammatically correct.

The negated form of 自然(しぜん)な (natural). Widely used to describe anything that feels off, forced, or not genuine — from body language and facial expressions to language usage and physical phenomena.

Common collocations

不自然(ふしぜん)な動(うご)き: unnatural movement
不自然(ふしぜん)な表現(ひょうげん): unnatural expression (in language)
不自然(ふしぜん)な態度(たいど): unnatural attitude/manner
不自然(ふしぜん)な点(てん): suspicious/unnatural point

Usage

In language learning contexts, 不自然(ふしぜん) is commonly used to describe sentences or expressions that are grammatically correct but sound awkward to native speakers. Also used in detective/crime contexts to describe suspicious circumstances.

Similar words

不自然(ふしぜん): same word used as a noun or adverb (without な)
わざとらしい: obviously deliberate — implies someone is faking or putting on an act
違和感(いわかん)がある: to feel off — describes the feeling that something is not quite right

Related Words

Compare: わざとらしい (obviously deliberate)

general

Added 2026.4.2 11:51 · Revised 2026.9.2 13:02

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