skulduggery
skul·dug·gery
noun
Origin
An alteration of Scots sculduddery, sculdudrie (“adultery, unchaste behaviour; obscenity, lewdness”), of long-uncertain origin (probably a euphemism). Relation to skull is speculative at best and likely folk etymology. The American spelling skullduggery is in keeping with terms such as skillful and willful.
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Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.