1. not conforming to Jewish dietary laws
Usage: religious
2. not legitimate, proper, or acceptable
Usage: informal

Examples

• The restaurant served nonkosher meat, so observant Jews couldn’t eat there.
• Mixing dairy and meat products makes a meal nonkosher.
• His business practices seemed nonkosher to the ethics committee.
• The deal looked nonkosher from the start.
• She avoided nonkosher foods during her religious observance.
• The accounting methods were clearly nonkosher.