Lacking grace or fluency; labored and dull: a ponderous speech. See Synonyms at heavy.
[Middle English, from Old French pondereux, from Latin ponderōsus, from pondus, ponder-, weight; see (s)pen- in Indo-European roots.] pon'der·ous·ly adv., pon'der·ous·ness, pon'der·os'i·ty (-ŏs'ĭ-tē) n.
c.1400, "heavy, weighty, clumsy," from L. ponderosus "of great weight," from pondus (gen. ponderis) "weight" (see pound (1)). Meaning "tedious" is first recorded 1704.