Usage Note
Rapidísimo is the absolute superlative of rápido, formed with the suffix -ísimo. It does not express a comparison ('the fastest') but rather an intensified quality ('incredibly fast'). It agrees in gender and number: rapidísima, rapidísimos, rapidísimas. The suffix -ísimo is very productive in Spanish and generally preferred over adverb intensifiers like muy in emphatic, spoken registers.
Examples
"El tren llegó rapidísimo a la estación."
Natural Translation
The train arrived incredibly fast at the station.
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