Related Clues:

• 3-D figure
• Unbroken, as a line
• All muscle
• Unfaltering
• Not flimsy
• Firmly constructed
• Not hollow
• Continuous
• Dense
• Sphere, say
• Physical state of ice
• Like a good alibi
• Hepster's exclamation
• Hard and firm
• High school sweetheart, e.g.