The Collaborative International Dictionary
Mitigable
Mitigable \Mit"i*ga*ble\, a. Admitting of mitigation; that may be mitigated.
Wiktionary
mitigable
a. That can be mitigated
WordNet
mitigable
adj. can be alleviated
Usage examples of "mitigable".
But this state of affairs was allowed to continue over a year--in fact until the downfall of the Confederacy--without a hand being raised to mitigate the horrors of those places--without even an inquiry being made as to whether they were mitigable or not.