*sincero* sincere
*síndico* m. syndic, trustee
*Sinforosa* woman's name
*sino* besides; except; but
*síntoma* m. symptom
*siquiera* even; at least; *ni ——* not even
*sitio* m. site, place
*situación* f. situation
*sobrar* be more than enough; be over and above
*sobre* m. envelope; prep. on; above; over