- reliable; worthy of trust
"My servant is very faithful."
- having faith
"Some people are faithful to their god."
- engaging in sexual relations only with one's spouse or long-term sexual partner
"They had been faithful to each other all of their married life."
- loyal; adhering firmly to person or cause
"My dog is a very faithful dog."
- consistent with reality
"I would consider that a very faithful reproduction."
- The practicing members of a religion or followers of a cause.
"The faithful pray five times a day."