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French word bien sûr comes from French sûr (Safe. Sure, certain. Trustworthy.), French bien
sûr (French)
Safe. Sure, certain. Trustworthy.
bien (French)
Good looking, nice. Good, all right, great (+ de, des, du) a lot of. (colloquial) really (used as an intensifier). Indeed; so. Well A commodity, a good. A possession. Good as opposed to evil.
bien sûr (French)
Of course.