indélébile

/ɛ̃.de.le.bil/
1.
adjectiveSing

indelible

permanent (cannot be removed, washed out, or erased)

Fais gaffe, c’est un marqueur indélébile, ça ne partira pas.

Be careful, it’s a permanent marker — it won’t come off.

2.
adjectiveSing

unforgettable

lasting (a memory or impression that remains)

Cette soirée m’a laissé un souvenir indélébile.

That evening left an unforgettable memory for me.