隐约的英文翻译可以用 indistinct 或者 vague 来表示。例如：

这张照片画面很隐约，很难看清楚。(The image in this photo is indistinct, it's hard to see clearly.)
他说的话很隐约，我不太明白他在说什么。(His words were vague, I'm not quite sure what he was saying.)