a. [ Pref. dis- + loyal: cf. OF. desloial, desleal, F. déloyal. See Loyal. ] Not loyal; not true to a sovereign or lawful superior, or to the government under which one lives; false where allegiance is due; faithless;
Without a thought disloyal. Mrs. Browning.
adv. In a disloyal manner. [ 1913 Webster ]
n. [ Pref. dis- + loyalty: cf. OF. desloiauté, deslealté, F. déloyauté. ] Want of loyalty; lack of fidelity; violation of allegiance. [ 1913 Webster ]