In music, with rapidity or agility: commonly applied to a running passage.
The Century Dictionary (Public Domain)
Use "rapido" in a sentence
"In your example, "el habla rapido", 'habla' seems to be used as a noun meaning 'speech' as saying "the rapid speech", and the adjective 'rapido' is used."
"But more often I think I hear 'rapido' used to say 'fast' as in "He talks fast.""
"We decided to take the 'rapido' mini bus from Leon to save ourselves from another chicken bus ride - a wise move indeed."