Definition

The quality of not being loyal or faithful, especially in a romantic relationship.

Example

His unfaithfulness led to the end of their marriage.

Conversation

Did you hear about Sarah and Jake?

Yeah, I can't believe they broke up over unfaithfulness.

It really makes you think about trust in relationships.

Absolutely, it's sad when unfaithfulness comes into play.

Synonyms & Antonyms

Root Explanation

Unfaithfulness → It is formed from "un-" (meaning not) and "faith" (from Old French *feid*, meaning trust or belief) and "-ness" (meaning the state of). The word describes the state of not being faithful or trustworthy.

Memory Tip

Think of 'not' ('un-') being combined with 'trust' ('faith') and the state of being ('-ness') — this helps you remember that unfaithfulness means the state of not being trustworthy.

Visually Confused Words