perfidious
不誠実な
解説 Definition
背信的で不誠実。信頼や信義を裏切るような性質。
If someone is perfidious, they are deliberately unfaithful and cannot be trusted, especially because they betray a person, group, or promise. The word is usually used in formal or literary contexts. It has a stronger meaning than simply saying someone is dishonest.
覚え方のコツ Memory Tip
perfidious は、単なる dishonest「うそをつく」より重く、trust を裏切る感じが中心。覚えるときは「味方だと思っていた ally が土壇場で寝返る」場面を固定すると残りやすいです。a perfidious ally, perfidious conduct のように、人や行為に使われやすく、『不親切』『不誠実』より一段強い『背信的・裏切りのある』語だと押さえるのがコツ。treacherous にかなり近いが、特に“信頼を受けたのに裏切る”という芯を意識すると区別しやすくなります。
Remember this as stronger than just dishonest. A perfidious person breaks trust, like an ally who suddenly turns against you at the worst moment. Compare it with treacherous, but keep the idea of betrayal after trust at the center.
例文
His perfidious actions betrayed his closest friend.
彼の不誠実な行為は彼の最も近い友人を裏切りました。
Perfidious behavior damages trust and relationships.
不誠実な行動は信頼と関係を傷つけます。
The perfidious nature of his conduct was exposed.
彼の行為の不誠実な性質が明らかにされました。
perfidious の類義語・関連語
perfidious の語源・成り立ち Etymology
「perfidious」はラテン語 perfidia「背信」に由来し、per-「すっかり」+ fides「信義・信頼」が核です。つまり「信義を完全に踏み外す人」で、ただ不親切なのではなく、信頼を裏切る感じが語形に出ています。関連語はfidelity、confide。
Perfidious comes from Latin perfidia, meaning "treachery" or "faithlessness." It is built from per-, giving an intensive force, and fides, meaning "faith" or "trust." The word developed the sense of completely breaking trust or acting with deep disloyalty. Related English words from the same root include fidelity and confide.
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