infidel /inˈfi-del or -dl/

1. Someone who rejects a religion, esp Christianity or Islam
2. Loosely, someone who disbelieves in a particular theory, etc

1. Unbelieving
2. Sceptical
3. Disbelieving a religion

infidelˈity noun

1. Lack of faith or belief
2. Disbelief in religion
3. Unfaithfulness, esp in marriage
4. An instance of this
5. Treachery

• harmonicas
• harmonic conjugates
• harmonic division
• harmonichord
• harmonichords
• harmonic mean
• harmonic means
• harmonic minor
• harmonic motion
• harmonic motions
• harmonicon
• harmonicons
• harmonic pencil
• harmonic pencils
• harmonic progression
• harmonic progressions
• harmonic proportion
• harmonic range
• harmonic receiver
• harmonic receivers
• harmonics
• harmonic series
• harmonic triad
• harmonic triads
• harmonic wave