DISLOYAL, adjective [dis and loyal.] 1. Not true to allegiance; false to a sovereign; faithless; as a disloyal subject. 2. False; perfidious; treacherous; as a disloyal knave. 3. Not true to the marriage-bed. 4. False in love; not constant.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI