a.

1. 未说过的；未透露的
   This is an untold secret.

   这是一个未曾泄露的秘密。

2. 数不清的；无限的；无法形容的
   They experienced untold sufferings during the war.

   在战争期间他们经历了说不尽的苦难。

   Untold millions of dollars were spent on the project.

   花在这个计划上的钱不知道有几百万元了。

adj.

1. too much or too many to be counted; indescribable:
   thieves caused untold damage.
2. not narrated or told.