IPA: /ʌˈnɛθɪkli/
KK: /ʌˈnɛθɪkli/
In a way that is not morally right or fair.
The company acted unethically by ignoring safety regulations.
Unethically → It is formed from "un-" (meaning not) and "ethical" (from Greek "ethikos", meaning moral or relating to ethics) and the suffix "-ly" (meaning in a manner). The word "unethically" means in a manner that is not moral or not in accordance with ethics.
Think of 'not' ('un-') behaving in a 'moral' way ('ethical') — that's why unethically means acting in a way that is not moral.