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

• screwdrivers
• screwed
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• screwier
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• screwiness
• screwing
• screwing dice
• screwing die
• screwing machine
• screwing machines
• screwings
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• screw jack
• screw jacks
• screw nail
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• screw over
• screw-pile
• screw-piles
• screw pine
• screw pines