IPA: //ˌprɛdʒʊˈdɪʃəli//
KK: /prɛdʒʊˈdɪʃəli/
In a way that causes harm or disadvantage to someone or something.
The decision was made prejudicially, affecting the outcome for many involved.
Prejudicially → It is formed from "pre-" (meaning before), "judicium" (from Latin, meaning judgment), and "-al" (meaning pertaining to). The word "prejudicially" refers to something that pertains to a judgment made beforehand, often in a negative or harmful way.
Think of making a judgment 'before' ('pre-') having all the facts — that's why prejudicially means acting in a way that can harm someone based on an early judgment.