How to Say "slim" in Spanish
The Spanish word for “slim” is “delgado” — A1 level. This is a very common word in everyday Spanish.

Examples
Mi hermano es muy alto y delgado.
My brother is very tall and thin.
Después de la enfermedad, el perro se veía muy delgado.
After the illness, the dog looked very thin.
Ella prefiere usar ropa que la haga ver más delgada.
She prefers to wear clothes that make her look slimmer.
Gender and Number Agreement
Since 'delgado' is a descriptive word (adjective), its ending must match the person or thing it describes: 'el chico delgado' (masculine singular), 'la chica delgada' (feminine singular), 'los chicos delgados' (masculine plural).
Mixing up Delgadez and Flacura
Mistake: “Using 'flaco' in a formal context when you mean 'slim' or 'slender'.”
Correction: 'Delgado' is generally the safer and more neutral choice. 'Flaco' often implies being unhealthily or overly skinny.
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