resilient

Short definition from Wiktionary

Adjective

1. 1
   Returning quickly to original shape after force is applied; elastic. (of objects or substances)
2. 2
   Returning quickly to original shape after force is applied; elastic. (of objects or substances): Having the ability to absorb energy when deformed.
3. 3
   Returning quickly to normal after damaging events or conditions. (of systems, organisms or people)
4. 4
   Returning quickly to normal after damaging events or conditions. (of systems, organisms or people): Having the ability to recover from mental illness, trauma, etc.; having resilience.