sturdy

Adjective

• substantially made or constructed
  • sturdy steel shelves
    
  • sturdy canvas
    
  • a tough all-weather fabric
    
  • some plastics are as tough as metal
    

• not making concessions
  • took an uncompromising stance in the peace talks
    
  • uncompromising honesty
    

• having rugged physical strength; inured to fatigue or hardships
  • hardy explorers of northern Canada
    
  • proud of her tall stalwart son
    
  • stout seamen
    
  • sturdy young athletes
    

Related words

• Synonyms: 
  tough , uncompromising , inflexible , hardy , stalwart , stout
• Antonyms: 
  compromising , conciliatory , flexible