/ ˌʌnˈtəʊld; NAmE ˌʌnˈtoʊld/ adjective
1.
[ only before noun ] used to emphasize how large, great, unpleasant, etc. sth is
SYN immeasurable :
untold misery / wealth
These gases cause untold damage to the environment.
2.
( of a story ) not told to anyone
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WORD ORIGIN
Old English unteald not counted (see un- , told ).