Longman Dictionary of Contemporary English homepage

ethical

adjective
     
eth‧i‧cal [no comparative]
1 relating to principles of what is right and wrong [= moral]
ethical issues/questions/problems
The use of animals in scientific tests raises difficult ethical questions.
The president must have the highest ethical standards.
2 morally good or correct [≠ unethical]:
I don't think it's ethical for you to accept a job you know you can't do.
ethical investment policies (=investing only in businesses that are considered morally acceptable)
unethical
ethically adverb

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