Related Clues:
- With a high mass-to-volume ratio
- Dumb as a rock
- Like crowd during sold-out concert
- Not too quick on the uptake
- Uneven, random
- Tightly compressed
- Inconsistent power for new yacht
- Compact and tight together
- Really thick
- Like mercury
- Like pound cake
- Very compact
- Heavy, as a fog
- Irregular or uneven
- Intermittent, as fog