undreamt-of

基本解释

• adj.梦想不到的；想像不到的

同根派生

英汉例句

用作形容词 (adj.)

• They needed to learn skills undreamt of by their ancestors, including eventually the ability to read and write.
  他们需要学习祖先们梦想不到的技巧，乃至读和写的能力。
• All sorts of unexpected difficulties cropped up.
  种种想像不到的困难都发生了。