wide, extensive
茫 centers on vast, unclear expanses: something wide, extensive, and often hazy or hard to grasp fully. The given meanings of 'wide' and 'extensive' fit this sense of a boundless, indistinct space.
茫 combines 艹 (grass) with 汒, which itself is 氵 (water) and 亡. The character likely expresses the idea of a vast, watery grassland or an indistinct expanse, with 亡 possibly contributing a sense of vagueness or disappearance.
Grass 艹 growing over a wide, watery 氵 expanse that seems to vanish 亡 into the distance: 茫 is a vast, extensive, and hazy scene.
For ボウ, picture a bow (as in bow and arrow) stretching across the wide, hazy grassland: bow -> ボウ, and the bow's arc spans the extensive view.
vague
memories of the past events (being, becoming) far and distant
memories of the past events (being, becoming) far and distant
vast; boundless
endless river; boundless water
extensive; open; vast
vast (ocean, desert, etc.); boundless; extensive
vast; limitless; boundless
vast; boundless
stupor; stupefaction; trance; (being) dumbfounded
vast and blue (e.g. ocean)