from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. That cannot be mitigated: immitigable circumstances.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. That cannot be mitigated
from the GNU version of the Collaborative International Dictionary of English
- adj. Not capable of being mitigated, softened, or appeased.
from The Century Dictionary and Cyclopedia
- Not mitigable; incapable of being mitigated or appeased.
im- + mitigable (Wiktionary)