loyal

形容词 loyal:

1. steadfast in allegiance or duty
2. inspired by love for your country
   同义词：patriotic
3. unwavering in devotion to friend or vow or cause
   同义词：firm, truehearted, fast

1. We are loyal to our motherland.
   我们忠于祖国。
2. He remained loyal to me through thick and thin.
   他历尽艰辛始终都忠实於我。
3. Qualify your statement that "dog is loyal" by adding "usually".
   将你说的＂狗是忠诚的＂这句话修正一下，加上＂通常＂二字。
4. The vassal swore that he would be loyal to the king forever.
   这位封臣宣誓他将永远忠诚于国王。
5. I may say in all sincerity that you have been my most loyal friend.
   我可以非常真诚地说，你一直是我最忠实的朋友。
6. The soldiers are loyal to their country.
   士兵们忠于他们的国家。

loy.al

adj.（形容词）
Steadfast in allegiance to one`s homeland, government, or sovereign.
忠心的：对自己的祖国，政府或主权无限忠诚的
Faithful to a person, an ideal, a custom, a cause, or a duty.
忠诚的：对一个人。一种理想，习惯，事业，责任忠实的
Of, relating to, or marked by loyalty.See Synonyms at faithful
忠诚的：与之有关的，或有其特征的参见 faithful

来源：
French
法语
from Old French leial, loial
源自 古法语 leial, loial
from Latin lôg3lis [legal]
源自 拉丁语 lôg3lis [合法的]
from lôx lôg- [law] * see leg-
源自 lôx lôg- [法律] *参见 leg-

【引伸】
loy.ally
adv.（副词）