More or less like 'bone' with a similar vowel sound as in the word 'oak' but just a little bit longer.
The French d is virtually identical to English except that it is pronounced with the tip of the tongue against the teeth. The French letter e (with no accent) represents the neutral vowel sound that...
"day - oo - liar"
Rue- dee- crey- er
'le vocabulaire français'
It is pronounced (frawn-SAY) -- low emphasis on the N.(language, adjective) français, française(people) Français, Française