Describes someone who is careful or wary.
El guardoso anciano siempre revisaba dos veces antes de cruzar la calle, sin importar la prisa que tuviera.
The cautious old man always checked twice before crossing the street, regardless of how much hurry he was in.
Ella es muy guardosa al tomar decisiones importantes en su vida.
She is very cautious when making important decisions in her life.