How to Say "robust" in Spanish
The Spanish word for “robust” is “fuertes” — A1 level. This is a very common word in everyday Spanish.
English → SpanishA1
AdjectiveA1
well-built or resilient

Examples
Mis piernas están muy fuertes después de correr la maratón.
My legs are very strong after running the marathon.
Necesitamos cables más fuertes para levantar esa carga.
We need stronger cables to lift that load.
Ellos son atletas muy fuertes y dedicados.
They are very strong and dedicated athletes.
Adjective Agreement
Since 'fuertes' is an adjective, it must agree with the noun it describes. Because it ends in '-es', it is always plural. The singular form is 'fuerte'.
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