1) Causing harm or injury 2) Damaging 3) Detrimental 4) Detrimental or damaging 5) Harmful 6) Prejudicious 1) Damaging 2) Detrimental 3) Prejudicious 
• (a.) Biased, possessed, or blinded by prejudices; as, to look with a prejudicial eye. • (a.) Tending to obstruct or impair; hurtful; injurious; disadvantageous; detrimental.
Prej`u·di'cial adjective [ Latin praejudicialis belonging to a preceding judgment: confer French préjudiciel .] 1. Biased, possessed, or blinded by prejudices; as, to look with a prejudicial eye. [ Obsolete] Holyday. 2. Tending to obstruct or impair; hurt...
prejudicious adjective tending to favor preconceived ideas; `the presence of discriminatory or prejudicial attitudes in the white population`
causing prejudice or disadvantage; detrimental.