Related Clues:

• Cube or sphere
• Not striped, as a billiard ball
• Unhyphenated
• Reliable, as a citizen
• Nonliquid state
• Firmly established
• Sturdily built
• Chock-a-block
• Parallelepiped, e.g.
• Densely built
• Hardy, stalwart
• Concrete or reilable
• Firm, strong
• Stalwart, stout, tough
• Three-dimensional shape, not hollow