裏腹|うらはらurahara[0]heiban (flat)

1. na-adjective, nounopposite; reverse; contrary
   「見た目みためは悪わるくないがちょっと軽薄けいはくそう」な外見がいけんとは裏腹うらはらに、彼女かのじょはいないし、女性じょせいに手てが早はやいワケでもない。↗

   In contrast to his "not bad looks but seems a bit of a dandy" appearance, he didn't have a girlfriend and he wasn't particularly fast with the ladies.
2. na-adjective, nounfront and back; parallel to; back to back; adjacent to; inseparable from; inside and out

• Synonym逆ぎゃくNeutralOrder or direction turned the opposite way; the most widely used of these words, as in 「逆の立場」. 「裏腹」 is more about words and deeds, or surface and inside, being at odds.
• SynonymあべこべCasualColloquial. Position or order mixed up, as in 「靴をあべこべに履く」. 「裏腹」 is more about words and deeds going against one's true feelings.
• Synonym逆さまさかさまNeutralUpside down or back to front, as in 「逆さまに吊るす」. 「裏腹」 is more about words and deeds going against one's true feelings.
• Synonym表裏一体ひょうりいったいWrittenWritten/formal prose. Two seemingly opposite sides are in fact one. 「裏腹」 can also imply surface and inside are linked, so the two are not strict antonyms.
• Related逆しまさかしまWrittenWritten/formal prose. Covers top and bottom being reversed, or what is absurd and unreasonable. 「裏腹」 is more about words and deeds, or inside and outside, being opposite.
• Antonym一致いっちNeutralComplete agreement or correspondence, as in 「意見の一致」. It contrasts with 「裏腹」 as matching versus opposing.

Use 「裏腹」 when words and deeds, or surface and inside, are at odds, as in 「言葉とは裏腹に」. For reversed direction use 「逆」; for upside-down or mixed-up order use 「逆さま」 or 「あべこべ」. 「一致」 is the opposite.

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

1. 正反対せいはんたいなこと。相反あいはんしていること。