untold

Short definition from Wiktionary

Adjective

1. 1
   Not told; not related; not revealed; secret.
2. 2
   Not numbered or counted.
3. 3
   Not able to be counted, measured, told, expressed in words, or described; extremely large in scale, number, quantity, suffering, damage, etc.; uncountable, unmeasurable, immeasurable, indescribable, inexpressible.