The term 'keeping at it' can be defined by four crossword solutions: UNWAVERING, DETERMINED, PERSISTENT, and RELENTLESS. These words all describe a person or thing that is committed to a goal and does not give up easily. UNWAVERING means to remain firm in one's beliefs or actions, DETERMINED implies a strong will and a refusal to give up, PERSISTENT suggests a continuous effort despite obstacles, and RELENTLESS implies an unyielding attitude. All of these words together suggest that someone is dedicated to achieving a goal and will not stop until they have succeeded.