Borrowing from Dutch schelm
schelm (plural schelms)
- A villain capable of any evil.
1823, Walter Scott, Waverley Novels: Peveril of the Peak:
- Of her parents he knew nothing, except that "her father must have been a damned hundsfoot, and a schelm for selling his own flesh and blood to Adrian Brackel"
schelm m (plural schelmen, diminutive schelmpje n)
- (originally) rogue, scoundrel, fiend
- (figuratively) imp, prankster, rascal