How to Say "pathological" in Spanish
The Spanish word for “pathological” is “patológico” — B2 level.

Examples
El médico analizó el tejido patológico en el laboratorio.
The doctor analyzed the diseased tissue in the laboratory.
Juan es un mentiroso patológico; no puede decir la verdad.
Juan is a pathological liar; he cannot tell the truth.
Su obsesión por el orden se ha vuelto algo patológico.
His obsession with order has become something pathological (unhealthy).
Matching the Noun
This word changes its ending based on what you are describing. Use 'patológico' for masculine things (like 'el estado') and 'patológica' for feminine things (like 'la mentira').
Word Placement
Like most descriptive words in Spanish, put 'patológico' after the person or thing you are talking about.
Using 'enfermo' vs 'patológico'
Mistake: “Esa es una persona patológica.”
Correction: Esa es una persona enferma (unless you specifically mean their behavior is a clinical disease).
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