faithful

American  

[feyth-fuhl] / ˈfeɪθ fəl /

adjective

1. true to one's word, promises, vows, etc.

2. steady in allegiance or affection; loyal; constant.

   faithful friends.

   Synonyms:

   staunch, devoted, true

3. reliable, trusted, or believed.

4. strict or thorough in the performance of duty.

   a faithful worker.

5. adhering or true to fact, a standard, or an original; accurate.

   a faithful account;

   a faithful copy.

   Synonyms:

   exact, precise

6. Obsolete. full of faith; believing.

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noun

1. the faithful,

   1. the believers, especially members of a Christian church or adherents of Islam.

   2. the body of loyal members of any party or group.

faithful British  

/ ˈfeɪθfʊl /

adjective

1. having faith; remaining true, constant, or loyal

2. maintaining sexual loyalty to one's lover or spouse

3. consistently reliable

   a faithful worker

4. reliable or truthful

   a faithful source

5. accurate in detail

   a faithful translation

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noun

1. 1. the believers in and loyal adherents of a religious faith, esp Christianity

   2. any group of loyal and steadfast followers

Related Words

Faithful, constant, loyal imply qualities of stability, dependability, and devotion. Faithful implies long-continued and steadfast fidelity to whatever one is bound to by a pledge, duty, or obligation: a faithful friend. Constant suggests firmness and steadfastness in attachment: a constant affection. Loyal implies unswerving allegiance to a person, organization, cause, or idea: loyal to one's associates, one's country.

Other Word Forms

• faithfully adverb
• faithfulness noun
• overfaithful adjective
• pseudofaithful adjective
• quasi-faithful adjective

Etymology

Origin of faithful

First recorded in 1375–1425; faith, -ful

Explanation

Faithful describes someone who is reliable and consistent. If you're a faithful volunteer at the animal shelter, you show up every Saturday and work hard to help the animals. A faithful friend is loyal and steadfast — it's no wonder that many people consider their dogs to be their most faithful companions. Though faithful usually describes a person, you can also use it to talk about a particularly reliable object, like your faithful hiking boots. There's another sense of faithful that means "remaining true to," like faithful believers who pray and attend religious services regularly.

Example Sentences

Parliament-Funkadelic is playing a live show onstage while we stomp the pavement in faithful entrancement.

From Los Angeles Times • Apr. 14, 2026

But whether it is canals, railroads, or fiberoptic cables, investment in physical infrastructure around new technology tends to be remarkably faithful to long-run trends.

From Barron's • Apr. 3, 2026

He also appeared in the 2025 series of The Celebrity Traitors - but was the first faithful to be banished at the roundtable.

From BBC • Mar. 25, 2026

Despite his countless hours with Claude Code, Jin isn’t faithful to any one AI lab.

From The Wall Street Journal • Mar. 21, 2026

And then there is the good old AT, still quietly ticking along after six decades, unassuming, splendid, faithful to its founding principles, sweetly unaware that the world has quite moved on.

From "A Walk in the Woods" by Bill Bryson

Related Words

• affectionate
• ardent
• conscientious
• dependable
• devoted
• dutiful
• hard-core
• honest
• honorable
• loving
• obedient
• patriotic
• resolute
• scrupulous
• sincere
• staunch
• steadfast
• true
• trustworthy
• trusty