The Collaborative International Dictionary of English v.0.48:
Damnably \Dam"na*bly\, adv. 1. In a manner to incur severe censure, condemnation, or punishment. [1913 Webster] 2. Odiously; detestably; excessively. [Low] [1913 Webster]WordNet (r) 3.0 (2006):
damnably adv 1: in a damnable manner; "kindly Arthur--so damnably , politely , endlessly persistent!" [syn: damned, damnably, cursedly]