1. in a way that is extremely annoying, frustrating, or unpleasant; infuriatingly
Usage: informal; emphatic
2. in a way that deserves condemnation or is morally reprehensible
Usage: formal; archaic

Examples

• The traffic was damnably slow this morning.
• He was damnably rude to the waiter.
• It's damnably difficult to find a parking spot downtown.
• The system is damnably inefficient.
• She spoke in a damnably condescending tone.
• The weather has been damnably cold all week.