de tous les

listen to the pronunciation of de tous les
French - English
of all

Money is the root of all evil. - L'argent est la racine de tous les maux.

Cookie is the cutest of all the dogs. - Cookie est le plus mignon de tous les chiens.

Used as an intensifier with nouns to denote being ultimate
Used as an intensifier with superlative forms of adjectives

He was the greatest playwright of all.

See: 'of all people'