noun
a person who is loyal, constant, and steadfast in their allegiance to a person or cause
adjective
loyal, constant, and steadfast in one's allegiance to a person or cause
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The faithful servant carried out his duties diligently and without question.
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I know I can always count on my faithful friend to be there for me.
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She's been with her faithful bae for years now.
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The old oak tree stood tall and faithful, weathering every storm that came its way.