Strangely, bastardly is not a word, but the same meaning is served by the term dastardly. Once a serious insult, dastardly is now almost always used [sarcastic]ally. If used seriously, the speaker is most likely a [nancy boy] and/or [fop]. It is generally used in the phrase dastardly deed(s).
* These videos are coming directly from Youtube, they may or may not be most relevant to the word "Dastardly"
What is Define Dictionary Meaning?
Best thing is, its free and you can even contribute without creating an account.