The Old Czech hapax legomenon bnedovánie is used in the adaptation of the medieval knight romance Duke Ernest (Herzog Ernst). There are two hypotheses based on the lexical system: 1) the corrupt word is an archaic part of the word family constituted by the adjectiv sbedný and its derivates and it means,a (brilliant and amusing) social behaviour corresponding with norms of court; (but we cannot satisfactorily explain word-formative processes leading from the sbedný to the bnedovánie); 2) the word is the corrupt form of Old Czech noun burdovánie (but its use is not convincing in the existing context).