dastardly


MEANING :
1. cowardly
2. malicious; characterised by underhanded treachery; sneaking
USAGE EXAMPLE 1:
Terrorists are carrying out dastardly bomb blasts in various cities in the country in order to foment violence between communities.
USAGE EXAMPLE 2:
The dastardly attacks on September 11, 2001 will be an indelible date in U.S. history—and, in their shared hour of agony on that fateful day, one more bond between two sister cities.