adj. 25B6; adjective
lumpish furniture : CUMBERSOME, unwieldy, heavy, hulking, chunky, bulky, ponderous.
a lumpish young girl : STUPID, obtuse, dense, dim-witted, dull-witted, slow-witted, slow; lethargic, bovine, sluggish, listless; informal thick, dumb, dopey, slow on the uptake, moronic; Brit. informal dozy.
elegant, quick-witted, sharp.