faithful.
Loyal; adhering firmly to person or cause.
Meaning & usage
Loyal; adhering firmly to person or cause.
My dog is very faithful: he doesn't like to be petted by anybody else.
Having faith.
Reliable; worthy of trust.
My servant is very faithful.
Consistent with reality.
I would consider that a very faithful reproduction.
Engaging in sexual relations only with one's spouse or long-term sexual partner.
They had been faithful to each other all of their married life.
Injective in specific contexts, e.g. of representations in representation or functors in category theory.
Of a module, whose annihilator is zero.
Where this word comes from
From Middle English feithful, equivalent to faith + -ful.
The practicing members of a religion or followers of a cause.
The faithful pray five times a day.
The annual meeting was attended by the long-term party faithful.
Someone or something that is faithful or reliable.
Where this word comes from
From Middle English feithful, equivalent to faith + -ful.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.