fluide

/flɥid/
1.
adjective

smooth (without interruptions)

flowing (physically or figuratively)

seamless; easy to use or navigate

L'interface de l'application est très fluide, tout se fait sans accrocs.

The app's interface is very smooth; everything works without hiccups.

2.
nounmasculine

fluid

liquid (a substance that flows)

Le fluide de refroidissement est bas, il faut en ajouter.

The coolant is low; it needs to be topped up.