ponderous (adj.) Look up ponderous at Dictionary.com
c.1400, "thick;" early 15c., "heavy, weighty, clumsy," from Latin ponderosus "of great weight; full of meaning," from pondus (genitive ponderis) "weight" (see pound (n.1)). Meaning "tedious" is first recorded 1704. Related: Ponderously; ponderousness.