If you describe someone as evasive, you mean that they deliberately avoid giving clear direct answers to questions.
He was evasive about the circumstances of his first meeting with Stanley Dean.
他对与斯坦利·迪安第一次见面的情形避而不谈。
take evasive action
If you take evasive action, you deliberately move away from someone or something in order to avoid meeting them or being hit by them.
At least four high-flying warplanes had to take evasive action.
至少有4架高空飞行战机不得不采取退避行动。