What is the meaning of rugged?

adjective

• Sturdy and strong in constitution or construction; enduring.
  • usage: "with a house full of boys you have to have rugged furniture"
• Having long narrow shallow depressions (as grooves or wrinkles) in the surface.
  • usage: "furrowed fields"; "his furrowed face lit by a warming smile"
  • synonyms: furrowed
• Topographically very uneven.
  • usage: "broken terrain"; "rugged ground"
  • synonyms: broken
• Very difficult; severely testing stamina or resolution.
  • usage: "a rugged competitive examination"; "the rugged conditions of frontier life"; "the competition was tough"; "it's a tough life"; "it was a tough job"
  • synonyms: tough