|Noah Webster's Dictionary|
(a.) Not loyal; not true to a sovereign or lawful superior, or to the government under which one lives; false where allegiance is due; faithless; as, a subject disloyal to the king; a husband disloyal to his wife.
Disloyal (1 Occurrence)
Psalms 78:57 but turned back, and dealt treacherously like their fathers. They were turned aside like a deceitful bow. (See NIV)