Pronunciation: (un-fāth'ful), [key]
1. not faithful; false to duty, obligation, or promises; faithless; disloyal.
2. not sexually faithful to a spouse or lover.
3. not accurate or complete; inexact: an unfaithful translation.
4. Obs.unbelieving; infidel.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.