How to Say "useless person" in Spanish
The Spanish word for “useless person” is “incapaz” — B2 level.
English → SpanishB2
NounB2informal/critical
derogatory

Examples
No lo dejes a cargo, es un completo incapaz.
Don't leave him in charge, he is completely incompetent (a total bungler).
La junta directiva despidió a varios incapaces.
The board of directors fired several incompetent individuals.
Adjective becomes a Noun
In Spanish, many adjectives can be used directly as nouns (substantivized) when referring to a person who possesses that quality. Here, 'el incapaz' or 'la incapaz' means 'the incapable one'.
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