Here are some synonyms for plucky:
* Brave
* Courageous
* Spirited
* Game
* Determined
* Resilient
* Tenacious
Here are some examples of how "plucky" might be used:
* "The plucky little dog managed to escape from the burning building."
* "Despite the setbacks, the team remained plucky and continued to fight for victory."
* "She showed a plucky determination to succeed, even though the odds were stacked against her."
Essentially, "plucky" suggests a positive, can-do attitude, even in challenging circumstances.