fastly looks like it is a form of the word fast.
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.
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.
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.
11. (period without eating) 
a. el ayuno (M) 
She had to go on a fast before the operation.Tuvo que hacer ayuno antes de la operación.
intransitive verb
12. (to abstain from eating) 
a. ayunar 
Some people fast several times a year.Algunas personas ayunan varias veces al año.
1. (general) 
a. el ayuno (M) 
to break one's fastromper el ayuno
2. (religion) 
fast daydía de ayuno
intransitive verb
3. (general) 
a. ayunar 
fast [fɑːst]
faster (comparative)fastest (superlative)
1 (speedy) rápido; (Fot) [+film] de alta sensibilidad
he's a fast worker es un trabajador (muy) rápido; he's a fast talker es un pretencioso; he was too fast for me corrió más que yo; se me adelantó; fast and furious vertiginoso
the action is fast and furious, the scenes on the pirate ship a delight and the work that has gone into this masterpiece shines out from every frame ...the fast and furious trading in raw materials which was helping to push costs up With fewer rules than conventional basketball, the games are usually fast and furious Reaction to the policy change was fast and furious, with pro-Israel protesters gathering outside the US mission to the UN as soon as the draft was circulated
to pull a fast one on sb jugar una mala pasada a algn
2 [+clock] adelantado
my watch is five minutes fast mi reloj está or va cinco minutos adelantado
3 (Dep) [+pitch] seco y firme; [+court] rápido
4 (dissipated) [+person] lanzado; fresco; [+life] disoluto; disipado
5 (firm) fijo; firme
to make sth fast sujetar algo; to make a rope fast atar bien una cuerda; to make a boat fast amarrar una barca; fast friends íntimos amigos
6 [+colour, dye] que no destiñe
1 (quickly) rápidamente; deprisa
as fast as I can lo más rápido posible; he ran off as fast as his legs would carry him se fue corriendo a toda velocidad; how fast can you type? ¿a qué velocidad escribes a máquina?; don't speak so fast habla más despacio; faster! ¡más (rápido)!; not so fast! (interrupting) ¡un momento!; he'll do it fast enough if you offer him money se dará más prisa si le ofreces dinero; the rain was falling fast llovía mucho; as fast as I finished them he wrapped them up a medida que yo los terminaba él los envolvía
to play fast and loose with jugar con
2 (firmly) firmemente
fast asleep profundamente dormido; to hold fast agarrarse bien; mantenerse firme; to stand fast mantenerse firme; tie it fast átalo bien; it's stuck fast está bien pegado; [+door] está atrancado or atascado; to be stuck fast in the mud quedar atascado en el lodo; to be stuck fast in a doorway haberse quedado atascado en una puerta
fast food (n) comida (f) rápida; platos (m) preparados
fast track (n) vía (f) rápida
The accelerated programmes mentioned above are all modified from existing 3-year courses. The fast track allows suitable graduates to complete them `in a minimum of 24 months" Deputies chose neither the fast track to reform favoured by Yeltsin nor the more cautious approach of the Soviet Prime Minister
to be on the fast track to sth ir por la vía rápida hacia algo
This put the company on a fast track to privatization But be angry, hostile, and over-sensitive and you may be on the fast track to death
fast train (n) tren (m) rápido; Intercity (m); (Esp) Talgo (m); (Esp)
fast [fɑːst]
ayuno (m)
to break one's fast interrumpir el ayuno
The fast is broken at sunset, traditionally with dates and water
intransitive verb
fast day (n) día (m) de ayuno
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