effortless
adj. 不需费力的，容易的；（品质）自然的，天生具有的
例句
She liked him above all for his effortless charm.
她尤其喜欢他天生的魅力。
《柯林斯英汉双解大词典》
Often women are so good at multitasking that it appears it's all effortless.
通常女性很善于同时处理多项任务，而且看起来似乎完全不费力。
At first, you were wobbly, but then it becomes effortless.
起初，你摇摆不定，但是过一段时间就变得毫不费力了。
