不自然|ふしぜんfushizen[2]nakadaka (mid-high)

1. na-adjective, noununnatural; artificial; affected; strained
   我々われわれ二人ふたりがここにいるのは不自然ふしぜんだ。↗

   The two of us don't belong here.

• Synonym作為的さくいてきWrittenWritten/formal prose for something done deliberately, with obvious human contrivance; 「不自然」 is broader, just describing what looks awkward or off.
• SynonymわざとらしいCasualColloquial for acting a part or doing something deliberately put on; 「不自然」 is a more objective, neutral description.
• RelatedぎこちないNeutralStiff and clumsy in movement or speech, as in 「ぎこちない笑顔」; 「不自然」 is the more general term for anything that looks unnatural.
• Related人工的じんこうてきNeutralMade or processed by human hands rather than occurring naturally; 「不自然」 instead describes how something looks awkward or unnatural.
• Related人為的じんいてきWrittenWritten/formal prose for something caused by human action, as in 「人為的ミス」; 「不自然」 just describes an awkward, unnatural look.
• RelatedきざCasualColloquial for affected, showy behavior or dress that puts people off; 「不自然」 is more neutral and doesn't imply the person is showing off.
• RelatedきざっぽいCasualColloquial for an appearance or attitude that is somewhat affected; 「不自然」 is the more neutral, objective word.
• RelatedアーティフィシャルNeutralLoanword for man-made or artificial things, sometimes affected style too; used less often than 「不自然」, which stresses an awkward look.
• RelatedきざったらしいCasualColloquial and stronger: affected to the point of being annoying; 「不自然」 is a more neutral description of awkwardness.
• Antonym自然しぜんNeutralThe direct opposite: natural and unaffected, as in 「自然な笑顔」.

Default to 「不自然」 for anything that looks awkward or unnatural, as in 「不自然な笑い」. Use 「わざとらしい」 or the written/formal 「作為的」 for something done deliberately, 「ぎこちない」 for stiff, clumsy movement or speech, 「気障」 for affected showing-off, and 「人工的」「人為的」 for man-made things. The opposite is 「自然」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 自然しぜんではないこと。わざとらしいこと。