How to Say "dubious" in Spanish
The Spanish word for “dubious” is “sospechosos” — B1 level. This is a very common word in everyday Spanish.

Examples
Sus movimientos nos parecieron muy sospechosos.
Their movements seemed very suspicious to us.
Hubo ruidos sospechosos afuera de la casa toda la noche.
There were suspicious noises outside the house all night.
Los paquetes sospechosos fueron puestos en cuarentena.
The suspicious packages were quarantined.
Adjective Agreement
Since 'sospechosos' ends in '-os', it describes multiple nouns that are masculine (e.g., 'hombres', 'ruidos') or a mixed group of males and females.
Forgetting the Plural
Mistake: “Using 'sospechoso' when describing multiple things.”
Correction: Always make the adjective plural to match the noun: 'Los hombres eran sospechosos' (The men were suspicious).
Related Translations
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