Synonyms of fidelity

fidelity

noun

fə-ˈde-lə-tē 

as in loyalty

adherence to something to which one is bound by a pledge or duty

they have never wavered in their fidelity to the cause of freedom

Synonyms & Similar Words

• loyalty
• allegiance
• commitment
• dedication
• devotion
• faithfulness
• fealty
• steadfastness
• constancy
• adhesion
• attachment
• piety
• faith
• devotedness
• fastness
• affection
• troth
• reliability
• resolution
• dependability
• fondness
• determination
• firmness
• trustworthiness
• trustability
• trustiness

Antonyms & Near Antonyms

• infidelity
• disloyalty
• treachery
• unfaithfulness
• perfidy
• faithlessness
• inconstancy
• falsity
• falseness
• separation
• alienation
• perfidiousness
• disaffection
• estrangement

Synonym Chooser

How is the word fidelity distinct from other similar nouns?

Some common synonyms of fidelity are allegiance, devotion, fealty, loyalty, and piety. While all these words mean "faithfulness to something to which one is bound by pledge or duty," fidelity implies strict and continuing faithfulness to an obligation, trust, or duty.

marital fidelity

Where would allegiance be a reasonable alternative to fidelity?

The words allegiance and fidelity are synonyms, but do differ in nuance. Specifically, allegiance suggests an adherence like that of citizens to their country.

pledging allegiance

When would devotion be a good substitute for fidelity?

While the synonyms devotion and fidelity are close in meaning, devotion stresses zeal and service amounting to self-dedication.

a painter's devotion to her art

When can fealty be used instead of fidelity?

The meanings of fealty and fidelity largely overlap; however, fealty implies a fidelity acknowledged by the individual and as compelling as a sworn vow.

fealty to the truth

When might loyalty be a better fit than fidelity?

The words loyalty and fidelity can be used in similar contexts, but loyalty implies a faithfulness that is steadfast in the face of any temptation to renounce, desert, or betray.

valued the loyalty of his friends

When could piety be used to replace fidelity?

The synonyms piety and fidelity are sometimes interchangeable, but piety stresses fidelity to obligations regarded as natural and fundamental.

filial piety

Example Sentences

Recent Examples of fidelity

The Magnetophon was a high-fidelity reel-to-reel magnetic tape recorder. — IEEE Spectrum, 2 Aug. 2026

Everything has been brought up to a much higher level of fidelity. — Destiny Jackson, Deadline, 30 July 2026

That improvement allowed the system to maintain high circuit fidelity despite the large number of operations. — Neetika Walter, Interesting Engineering, 30 July 2026

Sanderson believes that the capture’s quality and fidelity also fueled some of the film’s word of mouth and will continue to do so for as long as theaters are willing to keep it. — Brian Welk, IndieWire, 27 July 2026

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