Quick answer
"Fast" is an adjective which is often translated as "rápido", and "rapid" is an adjective which is also often translated as "rápido". Learn more about the difference between "fast" and "rapid" below.
fast(
fahst
)
An adjective is a word that describes a noun (e.g. the big dog).
1. (quick)
a. rápido
We took a fast train to the airport.Tomamos un tren rápido al aeropuerto.
b. veloz
Marina got a fast car for her birthday.Marina recibió un coche veloz para su cumpleaños.
2. (ahead of time)
a. adelantado
My watch is ten minutes fast.Mi reloj va diez minutos adelantado.
3. (firm)
a. firme
The roots have to be fast in the soil.Las raíces tienen que estar firmes en el suelo.
b.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
I made the boat fast to a dock cleat.Amarré el barco a una cornamuza.
She jumped down from her horse, and tied the rope fast to a tree.Saltó de su caballo, y ató bien la cuerda a un árbol.
4. (that doesn't fade)
a. inalterable
You can use bleach when washing this sweatshirt, because the color is fast.Se puede usar blanqueador al lavar esta sudadera, porque el color es inalterable.
b. que no destiñe
You can wash it. The colors are fast.Puedes lavarlo. Los colores no destiñen.
5. (promiscuous)
a. disoluto
The sailors went looking for fast girls.Los marineros salieron en busca de chicas disolutas.
6. (film)
a. rápido
You’ll need fast film to take pictures at a sporting event.Necesitarás película rápida para tomar fotos en un evento deportivo.
b. sensible
I use fast film when taking pictures in bright light.Utilizo película sensible al tomar fotos con luz brillante.
7. (sports)
a. rápido
You really have to be alert, because this is a very fast playing field.Realmente tienes que estar alerta, porque es una cancha muy rápida.
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
8. (quickly)
a. rápidamente
They moved really fast, so we weren't able to follow them.Se movieron muy rápidamente, así que no los pudimos seguir.
b. rápido
It happened so fast that I hardly remember it.Sucedió tan rápido que apenas lo puedo recordar.
c. deprisa
They went faster and faster down the hill.Se fueron colina abajo cada vez más deprisa.
9. (firmly)
a. firmemente
He tied the rope fast to the pole.Ató la soga firmemente al poste.
10. (soundly)
a. profundamente
The baby was fast asleep.El bebé estaba profundamente dormido.
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).
11. (period without eating)
a. el ayuno
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
She had to go on a fast before the operation.Tuvo que hacer ayuno antes de la operación.
An intransitive verb is one that does not require a direct object (e.g. The man sneezed.).
12. (to abstain from eating)
a. ayunar
Some people fast several times a year.Algunas personas ayunan varias veces al año.
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rapid
An adjective is a word that describes a noun (e.g. the big dog).
1. (quick)
a. rápido
We can't kayak in the river because the current is too rapid.No podemos hacer kayak en el río porque la corriente es demasiado rápida.
b. veloz
Adding an enzyme to the vial will make for a much more rapid chemical reaction.Añadir una enzima al frasco hará que la reacción química sea mucho más veloz.
rapids
A plural noun indicates that there is more than one person, place, thing, or idea.
plural noun
2. (fast-moving water)
a. los rápidos
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
During our vacation, we went rafting on the whitewater rapids.Durante las vacaciones, fuimos a hacer rafting por rápidos de aguas bravas.
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