Definition: not changing any of the original details, facts, style, etc. Level: C2
这部电影改编是否忠实于原著？
Was the film adaptation ___faithful to the original book?
在他所有的艺术创作中，他都忠于自己的核心原则。
In all his artistic endeavors, he remained ___faithful to his core principles.
这部纪录片对历史事件进行了忠实的记录。
The documentary provides a ___faithful account of the historical events.
