It's unethical.

Meaning

It violates ethical principles.

Examples

• John: They're using misleading advertising to sell their product.
• Alice: That's wrong. <b>It's unethical</b>.
• John: I reported them to the consumer protection agency.
• Alice: Good for you. Deceptive marketing is completely unacceptable; <b>it's unethical</b> and they should be held accountable.