from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. In an insufferable manner.
from the GNU version of the Collaborative International Dictionary of English
- adv. In a manner or to a degree beyond endurance; intolerably
from The Century Dictionary and Cyclopedia
- In an insufferable manner; to an intolerable degree: as, insufferably bright; insufferably proud.
insufferable + -ly (Wiktionary)