Wiktionary
unexpectable
a. unusual, or unpredictable. Not expected.
Usage examples of "unexpectable".
The storms last year had been unusually hard, but then that wasn’t in itself unexpectable, so why were hard storms supposed to be a prelude to a Pass?
The storms last year had been unusually hard, but then that wasn't in itself unexpectable, so why were hard storms supposed to be a prelude to a Pass?
And they had achieved all this by their one unexpectable, sinister, alien power: the power to mindlie.