If something is seco, it has no water in it. Also, seco can mean that something is not wet.
Seco can make people think of dryness, thirst, or the desert.
Examples:
The desert is very seco.
My clothes are seco after being in the sun.
The seco ground cracked in the heat.
The seco towel didn't dry me at all.
After many days with no rain, the land was very seco.
The seco air made my throat hurt.
Seco can also mean that something is not sweet, but instead it is bitter or not good to eat.
This meaning of seco can make people think of unpleasant tastes or bad food.
Examples:
The medicine was very seco.
The seco fruit made my mouth feel funny.
The seco drink was not good.
The seco cake was not sweet at all.
The seco food made me make a funny face.
The seco taste was so bad, I had to spit it out.