What is the Latin word for ponderous?

The usual Latin words for “ponderous” are gravis, ponderōsus. The right choice depends on the sense; see the distinctions below.

English → Latin

“ponderous” in Latin

gravisheavy; pregnant; troublesome, hard ponderōsusheavy, weighty, ponderous

The English word ponderous itself goes back to Latin pondus, through ponderōsus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

ponderous

gravis (Cic.); magni ponderis (Liv.); ponderosus (Plin.). Vid: HEAVY.

Quick answer

What is the Latin word for ponderous?: The usual Latin words for “ponderous” are gravis, ponderōsus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.