FreeVocabulary
Tenacious
/təˈneɪʃəs/ adjective easyHolding firmly to a goal, belief, or grip and refusing to let go despite difficulty.
The tenacious reporter kept calling sources for months until someone finally confirmed the story.
Memory Trick
Tenacious comes from Latin 'tenere,' to hold -- think of a bulldog's tenacious jaw, which will not let go once it clamps down.