English Reference
adjective

unethical

adj.
US /əˈnɛθɪkəɫ/ UK /ʌnˈɛθɪkəl/ un·eth·i·cal

  1. 01 B2 Upper Intermediate

    wrong or dishonest according to general moral principles.

    morally reprehensible or lacking in moral principles; not conforming to accepted standards of right and wrong.

    Simple

    It is unethical to lie to your customers just to make a sale.

    In context

    Many people believe that testing cosmetic products on animals is fundamentally unethical, regardless of the potential benefits to the industry.

  2. 02 B2 Upper Intermediate AcademicFormal

    breaking the official rules or standards of a specific job, like a doctor or lawyer.

    violating the formal code of conduct or established standards of a particular profession or organization.

    Simple

    The lawyer was punished for unethical behavior after sharing private information about a client.

    In context

    The medical board launched an investigation into the surgeon's unethical practices after several patients reported being pressured into unnecessary procedures.

But at the moment, AI is often used in ways researchers find annoying and unethical.

Ars Technica· 10 Aug 2026

From un- + ethical.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Level B2 · Upper Intermediate
Frequency Frequent
Updated