Nay, it was indeed proved that he must be disloyally plotting something, or he would have come down with his sister to the city when she came.
"The Soul of a People"
H. Fielding
He continued his search until he found him, and to him he made his claim and protest about his uncle, the emperor, who, in order to disinherit him, had disloyally taken a wife, which it was not right for him to do; for he had sworn to his father that he would never marry in his life.
"Four Arthurian Romances "Erec et Enide", "Cliges", "Yvain", and "Lancelot""
Chretien DeTroyes
She was a little unstrung and tremulous, pursued by a feeling that she was somehow letting herself go, behaving disloyally and indecorously towards whom?
"Marcella"
Mrs. Humphry Ward