quietly

being self-assured without being boastful or loud

showing resolve in a calm and understated way

showing satisfaction in a subtle, non-obvious way

having a graceful and stylish quality that is not loud or flashy

showing amusement in a subtle, non-obvious way

s'asseoir tranquillement

to be seated without moving or making noise

s'asseoir sans faire de bruit

parler doucement

to talk at a low volume

dire tranquillement

to utter words at a low volume

parler d'une manière calme et gentille

marcher silencieusement

to walk without making much sound

marcher sans faire beaucoup de bruit

murmurer tranquillement

to speak very softly, using one's breath without one's vocal cords

murmurer de manière à faire très peu de bruit

rire doucement

to make the sounds of laughter at a low volume

émettre les sons du rire à voix basse

to shed tears with little or no sound