Assertiveness

adjective describing a person who is determined and resolute in their beliefs or actions

• She is known for being a strong-willed leader who never backs down from a challenge.
• My sister is so strong-willed, once she sets her mind on something, there's no changing it.
• That girl is seriously strong-willed, she always gets what she wants.
• His strong-willed determination was like a force of nature, unstoppable and fierce.

adjective characterized by indecision, lack of firmness, or inconsistency

• The politician's wishy washy stance on the issue left many constituents feeling uncertain.
• I don't trust his wishy washy answers, he needs to be more straightforward.
• Stop being so wishy washy and make a decision already!
• Her wishy washy attitude towards life is preventing her from reaching her full potential.