adj. 25B6; adjective
his eyes were leaden with sleep : DULL, heavy, weighty; listless, lifeless.
he moved on leaden feet : SLUGGISH, heavy, lumbering, slow.
leaden prose : BORING, dull, unimaginative, uninspired, monotonous, heavy, laboured, wooden.
a leaden sky : GREY, greyish, black, dark; cloudy, gloomy, overcast, dull, murky, sunless, louring, oppressive, threatening; poetic/literary tenebrous.