— unfaithfully , adv. — unfaithfulness , n.
/un fayth"feuhl/ , adj.
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.
[ 1350-1400; ME unfeithful. See UN- 1 , FAITHFUL ]
Syn. 1. untrustworthy, deceitful, treacherous, recreant. 3. imprecise, untrue.