Related Clues:
- Like sold-out show crowd
- Studies English? Foolish
- What's discovered in ultrasound imaging is badly lit
- With a high mass-to-volume ratio
- Dumb as a rock
- Turn down a little, as lights
- Not even close to bright
- Opposite of bright
- Like crowd during sold-out concert
- Not too quick on the uptake
- Slow to learn
- Throw some shade?
- With poor visibility, just over half a kilometre?
- Not bright, as a light
- Dampen, as a headlight