noun
tenacity; perseverance; effort
Refers to the quality of sticking with a task, showing determination, or putting in sustained effort. Often used in contexts of encouragement or describing someone's work ethic.
彼の頑張りにはいつも感心する。
I'm always impressed by his perseverance.
最後まで頑張りを見せてほしい。
I want you to show your tenacity until the end.
Noun form of the verb 頑張る (がんばる), which originally meant 'to insist on one's opinion' or 'to be stubborn', derived from 頑 (stubborn) and 張る (to stretch, to insist). The modern meaning of 'persevere' developed later.