This is the 756th most frequent French word.
complètement
Completely; entirely.
The word "complètement" emphasizes the total agreement being described.
Ils étaient complètement d'accord avec le plan proposé.
They were completely in agreement with the proposed plan.
Here, "complètement" stresses the full extent of her forgetfulness.
Elle a oublié complètement ses clés à la maison.
She completely forgot her keys at home.
In this case, "complètement" is used to indicate thorough or total preparation.