Grande (big) - Pequeño (small)
Antiguo (ancient) - Moderno (modern)
Redondo (round) - Cuadrado (square)
Nuevo (new) - Viejo (old)
Cómodo (confortable) - Incómodo (uncomfortable)
Sucio (dirty) - Limpio (clean)
Agradable (pleasant) - Desagradable (unpleasant)
Fea (ugly) - Bonita (pretty)