形容詞 disloyal:

1. showing lack of love for your country
   同義詞：unpatriotic
2. deserting your allegiance or duty to leader or cause or principle

1. Not adhering to promises, obligations, or allegiances; disloyal.
   不忠實的; 不守信的不堅持諾言、義務或忠誠的; 不忠誠的
2. The new president carried out a purge of disloyal army officers.
   新總統(tǒng)對不忠誠的陸軍軍官進行了一次整肅。
3. That person is disloyal to his associates.
   那人對同事不守信義。
4. He was disloyal to his country.
   他對祖國不忠。

dis.loy.al

adj.（形容詞）
Lacking loyalty.See Synonyms at faithless
不忠實的，不忠誠的參見 faithless

來源：
Middle English *disloial
中古英語 *disloial
from Old French desloial
源自 古法語 desloial
des- [dis-]
des- [表示.不，缺乏.的意思]
loial [loyal] * see loyal
loial [忠誠的，忠實的] *參見 loyal

【引伸】
disloy.ally
adv.（副詞）