Surefire in spanish

Seguro

pronunciation: seguɹ̩oʊ part of speech: adjective
In gestures

sure-fire [surefire] = infalible, garantizado, asegurado, segurísimo, de éxito seguro, de éxito garantizado, de éxito asegurado. 

Example: For example, asking where someone was born is not a sure-fire way of finding out what their accent is and may lead to erroneous assumptions.
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