What does 'vacillation' mean?

The term 'vacillation' refers to the act of wavering between different opinions or courses of action, essentially embodying the concept of going back and forth. This fits perfectly with the definition of being indecisive or uncertain, often leading to a lack of commitment to a particular choice. When someone is vacillating, they might struggle to make a decision, constantly shifting their stance.

In contrast, the other options do not align with the meaning of 'vacillation': being unnoticed does not have any connection to indecision; shortening something pertains to making it smaller or briefer, which also does not relate to the notion of wavering; and having a highly sophisticated demeanor speaks to a person's mannerisms or composure, which is unrelated to the concept of indecisiveness or fluctuation in choice. Thus, 'going back and forth' accurately captures the essence of 'vacillation.'