ponderous
Pronunciation: /ˈpändərəs
adjective
1 Slow and clumsy because of great weight: her footsteps were heavy and ponderous
1.1 Dull, laborious, or excessively solemn: Liz could hardly restrain herself from finishing all his ponderous sentences
Origin
late Middle English: via French from Latin ponderosus, from pondus, ponder- 'weight'.
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He pounded along. Running was not his thing. He felt ponderous, and no wonder. He weighed 280 pounds and it wasn't all muscle. Still, he had no choice. And you couldn't really call it running, more like a quick shuffle-walk.
The car was off the road on its side in a ditch behind him and Jolie was hurt, waiting beside it. He was headed toward the town they had passed through just a few minutes ago, but that had been at 60 MPH. Bob believed he could make eight miles, even in crummy shape. They had seen no traffic, in either direction all day. But there had been cars in the town. Damn the broken network. It used to be that cell phones worked almost anywhere. Nobody carried one anymore.