Por su voz cansada, pude deducir que no había dormido bien.
English: From her tired voice, I could infer that she had not slept well.
inferir /ˌinfeɾˈiɾ/ · verb · CEFR B2. Spanish translation of "infer".
See also: Vocabulary entry (Spanish)

Listen to how "inferir" sounds in Spanish.
This verb is shown in its dictionary form.
| Dictionary form | inferir |
|---|---|
| Use note | Use the form shown here as the lookup form. |
Por su voz cansada, pude deducir que no había dormido bien.
English: From her tired voice, I could infer that she had not slept well.
Los lectores a menudo deben inferir la verdadera opinión del autor solo por el tono.
English: Readers must often infer the writer's true opinion from the tone alone.
Deducimos por su respuesta rápida que ya conocía el tema.
English: We inferred from his quick reply that he was already familiar with the topic.
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