cowardly; meanly base; sneaking: a dastardly act.

1560–70; dastard + -ly

dastardliness, noun
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World English Dictionary
dastardly (ˈdæstədlɪ)
mean and cowardly

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1560s, "showing despicable cowardice," originally "dull," from M.E. dastard.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He shouldn't worry: those dastardly immigrants will be there to look after him.
There's nothing evil or dastardly about insurers doing this.
Traditionally, science fiction goes for a sense of wonder with exotic aliens and nifty rocket ships and dastardly villains.
Yes, our enemies use and know how to use modern means of communication to plan, coordinate and carry out their dastardly deeds.
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