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Único vs. singular

Word practice demo
While both único and singular can translate to unique in English, they are not interchangeable. The key difference is that único typically refers to quantity (being the only one), while singular refers to a quality (being remarkable or extraordinary).

Único

A2
Único primarily means only or sole, emphasizing that there is just one of something. When placed after a noun, it can also mean unique in the sense of being one-of-a-kind and exceptionally special.
Es mi único par de zapatos para el invierno.
(It is my only pair of shoes for the winter.)
La única persona que puede ayudarte es tu hermano.
(The only person who can help you is your brother.)
Esta es una oportunidad única en la vida.
(This is a once-in-a-lifetime opportunity.)
El artista tiene un estilo único que lo distingue de los demás.
(The artist has a unique style that distinguishes him from the others.)
Fue el único sobreviviente del accidente.
(He was the only survivor of the accident.)

Singular

B2
Singular describes something as remarkable, extraordinary, or peculiar. It highlights a special quality that makes a person, object, or situation stand out from the ordinary, focusing on its distinctive nature rather than its quantity.
El museo exhibe una colección de singular belleza.
(The museum exhibits a collection of singular beauty.)
Tiene un sentido del humor muy singular.
(He has a very peculiar sense of humor.)
El detective resolvió el caso con una lógica singular.
(The detective solved the case with a remarkable logic.)
Fue un evento de singular importancia para la ciencia.
(It was an event of remarkable importance for science.)
La novela narra la historia de un personaje bastante singular.
(The novel tells the story of a rather unusual character.)

Summary

In essence, use único when you mean the only one or one-of-a-kind. Use singular to describe something as remarkable, extraordinary, or peculiar. While something that is único can also be singular, único emphasizes exclusivity, whereas singular emphasizes a noteworthy or unusual quality.