unmistakable
adj. 确定无疑的；不会弄错的
例句
Her accent was unmistakable.
她的口音是很明显的。
《牛津词典》
Black clouds are an unmistakable sign of coming rain.
乌云是下雨的明显先兆。
《新英汉大辞典》
He didn't give his name, but the voice was unmistakable.
他没有给出其名，但其声错不了。
《柯林斯英汉双解大词典》
