Definition

The act of being unfaithful to a partner, especially in a romantic relationship, which often involves having a sexual relationship with someone else.

Example

His infidelity caused a lot of pain in their marriage.

Conversation

Did you hear about Sarah and Tom?

Yeah, it's sad to see their relationship end because of infidelity.

I know, right? It makes me wonder how trust can be rebuilt after something like that.

It’s really tough, but some couples do find a way to work through it.

Synonyms & Antonyms

Root Explanation

Infidelity is formed from "in-" (meaning not) and "fidelis" (meaning faithful). The word describes a state of being unfaithful or lacking fidelity, particularly in a romantic or marital context.

Memory Tip

Think of 'not' ('in-') being 'faithful' ('fidelis') — that's why infidelity means being unfaithful.

Visually Confused Words