1.Definition: converted to solid form (as concrete)

Related Adjective(s):set

2.Definition: made hard or flexible or resilient especially by heat treatment

Related Adjective(s):tempered, toughened, treated

3.Definition: made tough by habitual exposure

"Hardened fishermen"

Related Adjective(s):enured, inured

4.Definition: protected against attack (especially by nuclear weapons)

"Hardened missile silos"

5.Definition: used of persons; emotionally hardened

"Faced a case-hardened judge"