leaden
1 burdensome, crushing, cumbersome, heavy, inert, lead, onerous, oppressive
2 humdrum, laboured, plodding, sluggish, stiff, stilted, wooden
3 dismal, dreary, dull, gloomy, languid, lifeless, listless, spiritless
4 dingy, grey, greyish, lacklustre, louring or lowering, lustreless, overcast, sombre