Used to describe something that is filthy or in poor condition.
La habitación estaba en un estado guarnezco después de la fiesta.
The room was in a squalid state after the party.
La habitación era guarnezco, con basura acumulada en cada rincón y un olor desagradable.
The room was squalid, with trash piled up in every corner and an unpleasant smell.