IPA: /dʒɛnˈtiːli/
KK: /dʒɛnˈtiːli/
In a way that is polite, refined, or well-mannered, often associated with the upper class.
She spoke genteelly, making sure to use proper etiquette at the dinner party.
Genteelly → It is formed from "gentle" (from Old French *gentil*, meaning noble or well-born) and the adverbial suffix "-ly" (meaning in a manner of). The word "genteelly" means in a manner that is noble or refined, reflecting the qualities of gentleness.
Think of 'gentle' as being noble or refined, and remember that 'genteelly' describes behaving in a refined manner.