terrierlike

Example:His dogged determination was terrierlike when he was determined to solve the case.

Definition:Persistent, determined, and hardworking; especially with difficult or disheartening odds.

Example:Her spunky and terrierlike attitude helped her through the toughest projects.

Definition:Having or displaying spirit or pluck; especially, being boldly enterprising and willing to take personal risks.

Example:He exhibits a tenacious and terrierlike spirit in his pursuit of justice.

Definition:Directed or strongly persistent in purpose, planning, or execution.