/ ˈpɒndərəs; NAmE ˈpɑːn-/ adjective ( formal )
1.
( disapproving ) ( of speech and writing ) too slow and careful; serious and boring
SYN tedious
2.
moving slowly and heavily; able to move only slowly
SYN laboured :
She watched the cow's ponderous progress.
► pon·der·ous·ly adverb
► pon·der·ous·ness noun [ U ]
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WORD ORIGIN
late Middle English : via French from Latin ponderosus , from pondus , ponder- weight.