1. Physically toughened
   - tough 
2. Made hard or flexible or resilient especially by heat treatment
   - tempered, treated, hardened

1. Make tough or tougher
   "This experience will toughen her"

See also: callous, calloused, curable, enured, experienced, experient, hardened, inured, rugged, strong, sunbaked, thickened, weather-beaten

Type of: strengthen

• caranday
• carangid
• carangid fish
• Carangidae
• Caranx
• Caranx bartholomaei
• Caranx crysos
• Caranx hippos
• carapace
• Carapidae
• Carassius
• Carassius auratus
• Carassius carassius
• Carassius vulgaris
• carat
• Caravaggio
• caravan
• caravan inn
• caravanning
• caravansary
• caravanserai
• caravel
• caraway
• caraway seed
• caraway seed bread