Fealty vs Fidelity

When to use each in English, with meaning, register, and examples.

Fealty

Formal Beyond 10,000 (less common)

Fidelity

	Fealty	Fidelity
Pronunciation	🇬🇧 //ˈfiːəlti// 🇺🇸 //ˈfiːəlti//
Meaning	A promise of loyalty to a lord or ruler.
Example	The knight pledged his fealty to the king during the ceremony.	-
Register	Formal	-
How common	Beyond 10,000 (less common)	-
Collocations	swear fealty, fealty to a lord, pledge fealty, oath of fealty	-
Antonyms	disloyalty, betrayal, treachery	-
Common mistakes	Confused with 'fidelity' which refers more to faithfulness in relationships., Misused in casual settings where simpler terms like 'loyalty' are appropriate.	-
Usage notes	Used primarily in historical or literary contexts. Not common in everyday speech, generally refers to loyalty in a feudal context.	-

See it in real clips

The Lord Of The Rings › The return of the king

Fealty with love.

Fealty

Avengers › Avengers Infinity War

My undying fidelity.

Fidelity

Frequently asked questions: Fealty vs Fidelity

What's the difference between Fealty and Fidelity?

Fealty: A promise of loyalty to a lord or ruler. Fidelity:

Can I use Fealty and Fidelity interchangeably?

Not always. Fealty and Fidelity are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.