Here are some possibilities:
* "ponderous": This word means heavy, slow, or dull. It can be used to describe something that is physically heavy or something that is difficult to understand or process.
* "ponderous": This word means to think deeply or carefully about something.
* "ponder": This word means to think about something carefully and at length.
If you could provide more context, I might be able to help you figure out the intended word.