Better to say "Quelque fois on trouve un homme qui est tres gentille."
The French word "gentil" is both masculine and feminine. It does not change in form regardless of the gender of the noun it describes.
"Gentille" (feminine) or "Gentil" (masculine) means nice in french "sympa" also means nice in french
gentil
gentil(le)
Etre gentil.
'il est gentil'
gentil/gentille
gentil(le)
nice is gentil / gentille or sympathique in French.
"vous (êtes) si gentil" means you (are) so nice in French.
The original language from which "jaunty" comes is French. It is derived from the French word "gentil," which means "nice" or "pretty."
amical(e) - gentil/gentille