What is the meaning of "vigor"?

The term "vigor" encompasses the ideas of energy, strength, and vitality. It often refers to a dynamic and robust state, indicating not only physical energy but also mental and emotional strength. When someone is said to approach a task or a challenge with vigor, it implies they are doing so enthusiastically and with a sense of power or assertiveness, which is characterized by an active and lively spirit. This aligns perfectly with the definition of energy and vitality, making it the most accurate choice in this context.

Other options, while representing different states or conditions, do not capture the essence of "vigor." For example, weakness and indecision convey a lack of strength, which is the opposite of what "vigor" signifies. Indifference and apathy suggest a lack of interest and engagement, again contrasting sharply with the enthusiasm suggested by "vigor." Calmness and tranquility describe a state of peace and lack of disturbance, which, while positive, does not encompass the dynamic characteristics implied by "vigor." Thus, energy and vitality stand out as the correct interpretation of the term.