名詞 faithful:

1. any loyal and steadfast following
2. a group of people who adhere to a common faith and habitually attend a given church
   同義詞：congregation, fold

形容詞 faithful:

1. steadfast in affection or allegiance
2. marked by fidelity to an original
   同義詞：close
3. not having sexual relations with anyone except your husband or wife, or your boyfriend or girlfriend

1. Dogs are more faithful animals than cats; these attach themselves to places, and those to persons.
   狗比貓忠心，后者依戀地方，前者依戀人。
2. Mary is faithful to her husband.
   瑪麗忠實(shí)于她的丈夫。
3. The lovers promised to be faithful forever.
   這對(duì)情人互相許諾永不變心。
4. His faithful pet dog bore him company.
   他那忠實(shí)的愛(ài)犬給他做伴。
5. A person who is fervently devoted, as to a leader or an ideal; a faithful follower.
   追隨者，獻(xiàn)身者熱忱地獻(xiàn)身的人，如向領(lǐng)袖或信仰; 忠誠(chéng)的追隨者
6. The dog remained faithful to his master.
   這條狗始終忠于它的主人。
7. This newspaper gave a faithful account of the event.
   這份報(bào)紙對(duì)那件事進(jìn)行了如實(shí)的報(bào)道。

faith.ful

adj.（形容詞）
Adhering firmly and devotedly, as to a person, a cause, or an idea; loyal.
忠心的：對(duì)人、觀點(diǎn)或事物絕對(duì)堅(jiān)定和效忠的；忠誠(chéng)的
Having or full of faith.
充滿信心的
Worthy of trust or belief; reliable.
可信的，可靠的：值得信任或信賴的；可信賴的
Consistent with truth or actuality:
符合事實(shí)的：與事實(shí)或?qū)嶋H一致的：
例句：
a faithful reproduction of the portrait.
與畫像一致的復(fù)制品

n.（名詞）
【復(fù)數(shù)】 faithful 或 faith.fuls
The practicing members of a religious faith, especially of Christianity or Islam:
信徒：職業(yè)教徒，尤指基督教或伊斯蘭教徒：
例句：
a pilgrimage to Mecca made by the faithful.
教徒前往麥加朝圣的旅途

A steadfast adherent of a faith or cause:
忠誠(chéng)分子：對(duì)事業(yè)或信仰的堅(jiān)定不移：
例句：
a meeting of the party faithful.
對(duì)黨效忠的聚會(huì)

【引伸】
faith.fully
adv.（副詞）
faith.fulness
n.（名詞）
<參考詞匯><同義詞>faithful,loyal,true,constant,fast,steadfast,staunchThese adjectives mean adhering firmly and devotedly to someone or something, such as a person, cause, or duty, that elicits or demands one`s fidelity.
如下形容詞都有對(duì)人、事，比如人、事業(yè)或責(zé)任等堅(jiān)定和忠誠(chéng)的意思。
Faithful andloyal both suggest undeviating attachment; the words are often interchangeable,thoughloyal is the term more often applied to political allegiance:
Faithful 和loyal 都含有對(duì)感情的忠貞； 兩個(gè)單詞可以互換，但loyal 更強(qiáng)調(diào)政治上的絕對(duì)效忠：
例句：
a faithful employee;
效忠的雇員；

例句：
gave faithful service;
提供忠誠(chéng)的服務(wù)；

例句：
a loyal companion;
忠誠(chéng)的伙伴；

例句：
a loyal citizen.
履行義務(wù)的公民。

True implies steadiness, sincerity, and reliability:
True 含有堅(jiān)定、忠誠(chéng)和依賴的意思：
例句：
.I would be true, for there are those who trust me. (Howard Arnold Walter).
.我會(huì)很忠誠(chéng)，因?yàn)橛心切┫嘈盼业娜说拇嬖? （霍華德·阿諾德·沃爾特）。

Constant stresses uniformity and invariability:
Constant 強(qiáng)調(diào)獨(dú)立性和不可變性：
例句：
.But I am constant as the northern star. (Shakespeare).
.但我會(huì)像北極星一樣永不動(dòng)搖. （莎士比亞）。

Fast suggests loyalty that is not easily deflected:
Fast 表示忠誠(chéng)不會(huì)輕易改變：
例句：
fast friends.
忠實(shí)的朋友。

Steadfast strongly implies fixed, unswerving loyalty:
Steadfast 著重強(qiáng)調(diào)不變的依附：
例句：
a steadfast ally.
固定聯(lián)盟。

Staunch even more strongly suggests unshakable attachment or allegiance:
Staunch 更強(qiáng)調(diào)不動(dòng)搖的依附或忠誠(chéng)：
例句：
.He lived and died a staunch loyalist. (Harriet Beecher Stowe).
.他自生至死都是一個(gè)效忠的?；庶h人. （哈瑞特·比舍·史托）