unreliable /ˌʌn.rɪˈlɑɪ.ə.bəl/ /ˌʌnrɪˈlaɪəbl/
shifty /ˈʃɪfti/ /ˈʃɪfti/
unfaithful /ʌnˈfeɪθfl/ /ʌnˈfeɪθfl/
unfaithful to one's promise