Correct Answer: Wavering

Solution : The second option is the correct choice.

The word resolute is an adjective that describes someone who is determined, unwavering, and firm in their decisions or actions. The antonym indecisive is fitting because it describes someone who has difficulty making decisions, lacks determination, or is hesitant.

The meanings of the other words are as follows:

• Steadfast describes someone or something that is resolutely or unwaveringly firm and determined in purpose, loyalty, or resolve.
• Wavering is an adjective that describes someone or something as unsteady, uncertain, or indecisive.
• Serious refers to something that is considered important, significant, or has severe consequences.