disloyal /dɪsˈlojəl/ adjective Learner's definition of DISLOYAL
[more disloyal; most disloyal]
: failing to support or be true to someone or something : not loyal or faithful to your friends, family, country, etc.不忠实的;不忠诚的;不守信义的 —
often + to — disloyalty
/dɪsˈlojəlti/ noun [noncount]