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Synonyms for Scheming (same or very similar meaning)

WordNet sense 1 (used of persons):
calculating, calculative, conniving, shrewd

WordNet sense 2 (dispassionate):
hard

WordNet sense 3 (concealing crafty designs for advancing your own interest):
designing

WordNet sense 4 (marked by skill in achieving a desired end especially with cunning or craft):
artful


From the ODE community, based on WordNetadd/edit