The best replacement for legal is ethical.

The best alternatives to legal are rated as following:
★★★★★  ethical
★★★  letter size
★★★  physical custody
★★  letter
★★  lawful
★★  moral
★★  illegal immigration
★★  illegal
★  illegal drugs
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  paralegal
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  compliance
  unethical

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Speaking about legal, one probably shouldn't forget about prejudice definition.

Other search terms related to legal and their ratings are:
★★★★★ prejudice definition
reservation
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Google Trends

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legal
ethical
letter size