of great weight; heavy; massive.

awkward or unwieldy

He carried a ponderous burden on his back.

dull and labored

a ponderous dissertation.

adjective

airy , buoyant , delicate , light , unburdensome , fun

adjective

awkward , bulky , burdensome , clumsy , cumbrous , dull , elephantine , graceless , hefty , huge , laborious , lifeless , lumbering , massive , onerous , oppressive , substantial , troublesome , unhandy , unwieldy , weighty , arid , barren , cardboard , dry , heavy , humdrum * , labored , long-winded * , monotonous , pedantic , pedestrian , plodding , prolix , stiff * , stilted , stodgy , stuffy * , vapid , verbose , wooden * , heavyweight , cumbersome , lumpish , lumpy , heavy-handed , dreary , humdrum , important , large , spiritless momentous , tedious