1. 
[syn: foully, insultingly]
2.  in a wicked and shameful manner; 
- Example: "two policemen were foully murdered"
The Collaborative International Dictionary of English v.0.48:
Foully \Foul"ly\, v.
   In a foul manner; filthily; nastily; shamefully; unfairly;
   dishonorably.
   [1913 Webster]
         I foully wronged him; do forgive me, do. --Gay.
   [1913 Webster]
WordNet (r) 3.0 (2006):
foully
    adv 1: in an unfair and insulting manner; "this internationally
           known writer was foully condemned by the Muslim
           fundamentalists" [syn: foully, insultingly]
    2: in a wicked and shameful manner; "two policemen were foully
       murdered"