Refers to someone who dismisses or undervalues something.
El desestimador no se molestó en escuchar las preocupaciones de sus colegas, lo que generó un ambiente tenso en la oficina.
The dismissive person did not bother to listen to his colleagues' concerns, which created a tense atmosphere in the office.
El desestimador nunca toma en serio las ideas innovadoras que propone el equipo creativo.
The dismissive person never takes seriously the innovative ideas proposed by the creative team.