不 忠 実(ふちゅうじつ)

ふちゅうじつ

na-adjective

unfaithful; disloyal; untrue

1. unfaithful; disloyal; not true to one's obligations

Lacking faithfulness or loyalty to a person, duty, or commitment. Used for romantic infidelity, professional disloyalty, and failure to honor obligations.

不忠実(ふちゅうじつ)な態度(たいど)は信頼(しんらい)を失(うしな)う。

A disloyal attitude causes loss of trust.

彼(かれ)は仕事(しごと)に対(たい)して不忠実(ふちゅうじつ)だと思(おも)われている。

He is considered unfaithful to his work.

原作(げんさく)に不忠実(ふちゅうじつ)な映画化(えいがか)に対(たい)してファンから批判(ひはん)の声(こえ)が上(あ)がった。

Fans criticized the film adaptation for being unfaithful to the original work.

The negative form of 忠実(ちゅうじつ) (faithful; loyal), formed with the prefix 不(ふ). Functions as a na-adjective: 不忠実(ふちゅうじつ)な + noun, 不忠実(ふちゅうじつ)だ as predicate.

Common collocations

不忠実(ふちゅうじつ)な態度(たいど): disloyal attitude
不忠実(ふちゅうじつ)な翻訳(ほんやく): unfaithful translation
原作(げんさく)に不忠実(ふちゅうじつ): unfaithful to the original
不忠実(ふちゅうじつ)な部下(ぶか): disloyal subordinate

Similar words

不誠実(ふせいじつ): insincere; dishonest — focuses on sincerity rather than loyalty
裏切(うらぎ)り: betrayal — a stronger, more active word implying deliberate treachery
不義理(ふぎり): failing in one's social obligations — specifically about social duty

Related Words

Compare: 不誠実(ふせいじつ) (insincere)

Compare: 裏切(うらぎ)り (betrayal)

Compare: 不義理(ふぎり) (failing in one's social obligations)

general

Added 2026.5.2 23:34 · Revised 2026.9.2 13:02

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