WordWeb Online

1. Showing lack of love for your country
   "base and disloyal motives";
   - unpatriotic
    
2. Deserting your allegiance or duty to leader or cause or principle
   "disloyal aides revealed his indiscretions to the papers"

See also: faithless, insurgent, loyalty, mutinous, rebellious, recreant [archaic], renegade, seditious, subversive, traitorous, treasonable, treasonous, trueness, un-American, unfaithful

Antonym: loyal

Encyclopedia: Disloyal