英汉词典

1. 不易察觉的;不明显的;微妙的
    Something that is subtle is not immediately obvious or noticeable.

    e.g. ...the slow and subtle changes that take place in all living things...
           发生在所有生物身上的缓慢而细微的变化
    e.g. Intolerance can take subtler forms too.
           过敏反应也可能会表现得很不明显。