This is the 10892nd most frequent German word.
sanfte
Gentle, soft.
In this sentence, 'sanfte' is used as an adjective modifying 'Brise' to describe its light and mild nature.
Die sanfte Brise kühlte unser Gesicht.
The gentle breeze cooled our faces.
'Sanftes' is an adjective here describing 'Lächeln,' indicating the kind and soft appearance of the smile.
Ihr sanftes Lächeln beruhigte die Stimmung.
Her gentle smile calmed the atmosphere.
In this case, 'sanften' is an adjective modifying 'Stimme,' reflecting its soothing and tender tone.