Indecisive; lacking the ability to make firm decisions and prone to hesitation or vacillation.
彼は優柔不断で、レストランでも何を食べるか決められない。
He is so indecisive that he can't decide what to eat even at a restaurant.
優柔不断な性格が原因で、仕事のチャンスを逃したことがある。
Because of his indecisive nature, he once missed a work opportunity.
重要な場面では優柔不断にならないよう、あらかじめ基準を決めておくといい。
In important situations, it's good to set criteria in advance so you won't become indecisive.