Never give up

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Across
  1. 2. Incapable of being tired out; tireless.
  2. 5. Firm and unwavering; not easily disturbed or influenced.
  3. 6. Firm and resolute; not giving in to pressure or persuasion.
  4. 7. Not intimidated or discouraged by difficulty, danger, or disappointment.
  5. 9. Remaining steadfast and determined, especially in the face of adversity.
  6. 11. Capable of recovering quickly from difficult conditions; bouncing back.
  7. 12. Marked by stubborn determination; tenacious.
  8. 16. Refusal to change one's views or to agree; stubbornness.
  9. 19. Continuing at full strength or intensity; without any reduction.
  10. 20. Tireless and unwavering in effort or enthusiasm.
Down
  1. 1. Incapable of being used up or depleted; endless.
  2. 3. Constant and steadfast in purpose or allegiance.
  3. 4. Continuing firmly in a course of action despite difficulty or opposition.
  4. 8. Not easing or slackening; persistent and determined.
  5. 10. Demonstrating steady persistence and determination.
  6. 13. Stubbornly refusing to change one's opinion or chosen course of action.
  7. 14. Brave and persistent; showing determination and resilience.
  8. 15. Impossible to subdue or defeat; unconquerable.
  9. 17. Loyal, steadfast, and resolute.
  10. 18. Not discouraged or prevented from continuing.