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"loyal" is also used as a crossword clue. If that's what you saw, the answer is often steadfast (9 letters).
Definitions
unwavering in devotion to friend or vow or cause
Word origin
Borrowed from Middle French loyal, from Old French loial, leial, leal, from Latin lēgālis. Doublet of legal and leal.
Used in a sentence
“Dogs are very loyal animals, which is why they make wonderful pets.”
“George is a loyal and loving husband.”
“We must remain loyal to the mission.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Faithful”5 letters
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