Incalculable

Adjective

1. Impossible to calculate.
2. Too much, too vast, or too numerous to enable computation.

   "The loss the National Library suffered from the fire is incalculable."

3. Of a person's mood or character, etc.: impossible to predict.

   "He is incalculable when he's drunk. He can turn from an amiable person into a violent horror in a moment."