Prejudicial means likely to damage somebody's case unfairly. Prejudicial evidence, prejudicial to a fair trial, unduly prejudicial.
It is a technical legal term and not the same word as prejudiced: evidence is prejudicial when its power to inflame outweighs what it proves, and a judge may exclude it for that reason even though it is true.
1adjectiveprejudicialLikely to damage somebody's case unfairly.
“The judge ruled that the newspaper article was prejudicial to a fair trial.”
prejudicial is a quality.
Latin praeiudicium means a preceding judgement — prae, before, plus iudicium, a judgement.
Medieval Latin
prēiūdiciālis
Old French
prejudicial
Middle English
prejudiceele
English, today
prejudicial
From Middle English prejudiceele, prejudicial, prejudiciall, prejudiciel, prejudiciell, prejudycyall, from Old French prejudicial, prejudiciel and Medieval Latin prēiūdiciālis.
Etymology from Wiktionary, CC BY-SA