From Latin 'mundus' (world/universe) — the entire physical cosmos was considered dull compared to heaven, making 'mundane' mean boring.
Lacking interest or excitement; dull; relating to the ordinary world.
From Latin 'mundanus' (of the world), from 'mundus' (world, universe). Originally a cosmological term contrasting earthly things with heavenly ones — the 'mundane sphere' was the physical universe as opposed to the divine realm. Things of this world were merely 'mundane' compared to heaven. Key roots: mundus (Latin: "world, universe").
Calling something 'mundane' is theological shade. Latin 'mundanus' meant 'of the world' — as in the entire physical universe. But medieval theology considered the earthly world inferior to heaven, so 'worldly' became 'merely worldly,' then 'ordinary,' then 'boring.' An entire cosmos was dismissed as uninteresting because it wasn't heaven. French 'mondain' (worldly, sophisticated