unfaithful

To be unfaithful means to break trust or fail to stay loyal, most often in a close relationship. Think of a dog: a faithful companion stays by your side no matter what. In contrast, an unfaithful friend may talk about you behind your back, and an unfaithful partner may cheat and betray your trust. The word is not only about romance, though. A person can be unfaithful to their values, their country, or a promise they made. Imagine a politician who promises change but then does the opposite; they are being unfaithful to the people who trusted them. At its heart, the word suggests betrayal and the pain of trust being broken.

"Unfaithful" describes a lack of loyalty or faithfulness. It points to a broken commitment to a person, a cause, or a standard. The word is most commonly used for romantic relationships, where an unfaithful partner is sexually or emotionally disloyal, but its use in English is broader than that.

At the center of the word is the idea of trust being broken or a bond not being honored. It suggests that someone has failed to stay true to what they promised, supported, or claimed to believe. For example, a person can be described as "unfaithful to their beliefs" if their actions repeatedly go against the values they say they hold. In a historical or military setting, someone might be called unfaithful to their oath if they betray their duty or the people they serve.

The word is also used for things that do not stay true to an original source. A film adaptation that changes the heart of a novel may be called "unfaithful to the book." In the same way, a biography can be called unfaithful to the facts if it distorts what really happened. In these cases, the idea is not romantic betrayal but a failure to match the truth or the original meaning. So when you see the word "unfaithful," think beyond romance and look for any case where trust, loyalty, or truth to an original has been broken.