ponderous

US /ˈpɑːn.dɚ.əs/
UK /ˈpɑːn.dɚ.əs/
"ponderous" picture
1.

slow and clumsy because of great weight

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The elephant's movements were surprisingly graceful despite its ponderous size.
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The old machine made a ponderous noise as it started up.
:
heavybulkyclumsyawkwardslow
2.

dull, laborious, or excessively solemn

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The speaker's ponderous delivery put half the audience to sleep.
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He wrote a ponderous academic paper on the subject.
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dullboringtediousmonotonoussolemn