cuerdo
/ˈkweɾdo/ · B1 · adj
sane
🧠 From Latin cordatus, wise: cor = heart, once thought the seat of reason
Romans placed good judgment in the heart (cor), so cordatus meant level-headed. Spanish wore it down to cuerdo, the opposite of loco. Contrast pair: estar cuerdo vs estar loco. Same root as English cordial and record.