New words：

faithful ['feiθfl] adj. 忠实的；忠诚的；如实的
faithfully [ˈfeɪθfəli] adv. 忠实地；如实地；忠诚地
faithless ['feiθlis] adj. 不忠诚的；不可信任的；不可信赖的

Sample Sentences：

A faithful friend helps in times of trouble.
Dogs are more faithful animals than cats.
If you don't keep promise, you are a faithless person.
He had supported the local team faithfully for 30 years.

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