detrimental

This term carries a formal tone and is typically used in professional, medical, or legal contexts to describe a negative impact. It suggests a gradual or systemic erosion of quality, health, or success rather than a sudden, violent destruction. While similar to harmful, it often implies a specific causal link where one factor actively undermines the viability or effectiveness of another. It is frequently paired with the preposition to, as in detrimental to the environment.