Related Clues:
- Just plain silly
- Tough to get through
- Like a dumbbell
- Heavy, like some baked goods
- Like a black hole
- In the nature of supposedly stupid animal
- Thick, compact or crowded
- Thick, compact
- Foolish like a donkey
- Really silly, ridiculous
- Is inane to be foolish
- Thick as undergrowth may be
- Silly like a donkey
- Mindless, vacuous
- Foolish as a donkey