Lo - Neuter Article

In addition to the definite and indefinite articles, Spanish has what is called a neuter article. This article, lo, is invariable and is used in front of just about any adjective in order to express something abstract or a quality.

lo fácil the easy thing, part
lo bueno the good thing
lo bello what's beautiful
lo justo what is just
lo mejor the best part

Lo + adjective is usually translated in English as The adjective thing/part/one/style or What is adjective. For example,

Lo difícil es que no comprendo la diferencia. The hard thing is that I don't understand the difference.
No viste lo mejor de la película. You didn't see the best part of the movie.
Lo importante es que estamos juntos. What's important is that we are together. (or) The important thing is that we are all together.
Me gusta lo azúl. I like the blue one.
Vestís a lo americano. You dress in the American style/like Americans.

The construction Lo adjective que means How adjective:

No sabes lo feliz que estoy. You don't know how happy I am.
Veo lo importante que es. I see how important it is.
Olvidé lo bello que eres. I forgot how beautiful you are.
¿Comprendes lo fácil que es? Do you understand how easy it is?


This neuter article is used to express a quality or an abstract idea.


NOTE: That Lo + adjective or adverb + que is equivalent to the English expression how.