Usage Note
Jalousement most commonly collocates with garder — garder jalousement un secret means to guard a secret jealously. It derives from jaloux/jalouse (jealous), but in adverbial use the sense is often closer to 'fiercely protective' than to romantic jealousy. The root noun is la jalousie (jealousy, but also a slatted blind/shutter).
Examples
"Il gardait jalousement ses recettes de famille."
Natural Translation
He jealously guarded his family recipes.

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