What does «sandez» mean in Spanish?

Necessity, foolishness. That which is done without reason, inopportune, illogical.

Examples of use in Spanish: "Es una sandez lo que has hecho".
Clumsy, inadequate or without reason or logic.

Examples of use in Spanish: "¡Deja de decir sandeces! puras tonterías".
Sandio quality: foolish or simple.