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," from stem of pendere "to hang, cause to hang; weigh" (from PIE root *(s)pen- "to draw, stretch, spin"). Meaning "tedious" is first recorded 1704. Related: Ponderously; ponderousness.