忠実な
解説 Definition
約束や信念を守ること。夫や妻に対して真実を守ること。また、信仰に忠実なこと。
Faithful means loyal, reliable, and true to someone or something. It is used for people, pets, supporters, or descriptions that stay close to the original. In some contexts, it can also mean having strong religious belief.
覚え方のコツ Memory Tip
faithful は faith（信頼・信念）から広がる形容詞で、「決めた相手・約束・信仰・原作から離れず、そのまま守る」と考えると覚えやすいです。be faithful to ... や remain faithful to ... の形で「〜に忠実であり続ける」とよく使います。配偶者に対して真実を守る、信仰を守る、翻訳や映画化が原作に忠実である、というように対象への一貫した維持を表します。
`Faithful` grows from `faith`, so it carries the idea of staying true and not turning away. Learn patterns like `be faithful to` and `remain faithful to`. It can describe relationships, beliefs, duties, or a copy that stays true to the original.
例文
He remained faithful to his wife for many years.
彼は長年妻に忠実だった。
The faithful followers attended the church every Sunday.
忠実な信者たちは毎週日曜日、教会に通った。
She was faithful to her promise.
彼女は約束を忠実に守った。
誠実な
(意味 2)解説 Definition
人の態度や人柄が正直で、約束や信頼を大切にすることを表します。友人・恋人・仕事相手など、人間関係の中で安心して信じられる相手をいうときによく使います。
If a person is faithful, they are honest and dependable in their relationships with other people. They keep promises and do not easily betray someone's trust. This word is often used for a friend, partner, or coworker who makes others feel safe and secure.
覚え方のコツ Memory Tip
faith は「信頼・信念」を表す基本語で、-ful は「それで満ちている」という形容詞を作ります。faithful は「信頼を裏切らない性質で満ちている」と考えると、誠実な人柄につながります。honest は主に「うそをつかない」、sincere は「心からの」という感じが強く、faithful は関係や約束の中で信頼できる人に使われやすい語です。別義の「忠実な」と混同せず、人の誠実さに焦点を当てて覚えましょう。
Think of faith as "trust" or "belief," and -ful as "full of." A faithful person is someone who is full of trustworthiness and does not break trust. Honest often means simply "not telling lies," and sincere means "from the heart," but faithful is often used for someone you can trust in a relationship or promise.
例文
She is a faithful friend who always keeps her promises.
彼女はいつも約束を守る誠実な友人です。
Everyone trusted him because he was faithful in both his words and his actions.
彼は言葉にも行動にも誠実だったので、みんなが信頼していました。
A faithful business partner is hard to find and even harder to replace.
誠実な仕事のパートナーは、見つけるのも代わりを探すのも難しいです。
原作に忠実な
(意味 3)解説 Definition
作品・翻訳・描写などが、もとの内容や細部をあまり変えずに再現されていることを表します。人への忠誠ではなく、原文・原作・事実にどれだけ沿っているかを述べるときに使います。
When something is faithful, it follows the original work, text, or facts very closely. It is used for a movie, translation, description, or copy that keeps the main content and details with few changes. In this sense, faithful does not mean loyal to a person. It means being true to the source.
覚え方のコツ Memory Tip
faith を知っていれば入りやすい語です。faithful は「faith（信頼・信念）を持ち続ける」感じで、約束・人・信仰から離れないイメージで覚えると残ります。stay faithful to ... や be faithful to ... が頻出で、「〜に忠実だ」。loyal も近いですが、faithful は特に配偶者・信仰・原作への忠実さにもよく使われます。a faithful friend, faithful to his wife, a faithful copy までまとめて覚えると使い分けしやすいです。
If you already know faith, faithful is easy to remember. Think of it as "keeping faith" with someone or something, so it does not leave the original, the promise, or the truth. Common patterns are be faithful to and stay faithful to. It is often used for a spouse, a religion, or an original work, as in a faithful friend, faithful to his wife, and a faithful copy.
例文
The movie is faithful to the original novel.
その映画は原作小説に忠実だ。
Her translation is faithful to the tone and meaning of the poem.
彼女の翻訳はその詩の語調と意味に忠実だ。
The documentary gives a faithful account of what happened.
そのドキュメンタリーは出来事を忠実に描いている。
faithful の語源・成り立ち Etymology
古フランス語 feithful から。ラテン語 fides（信頼・信仰）が語根で、faith（信仰）+ -ful（満ちた）の構成。関連語：faith（信仰）、fidelity（忠誠）。「信頼に満ちた」が原義で、揺るがず信じ続ける誠実さを表す。
"Faithful" is built from "faith" and the suffix "-ful," meaning full of. "Faith" came through Old French from Latin fides, meaning trust or belief, and the same root appears in "fidelity." The original sense was being full of trust or loyalty, which developed into the idea of being steady, loyal, and true.
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