QUICK ANSWER
"Amazing" is a form of "amazing", an adjective which is often translated as "asombroso". "Fantastic" is an adjective which is often translated as "fantástico". Learn more about the difference between "amazing" and "fantastic" below.
amazing(
uh
-
mey
-
zihng
)An adjective is a word that describes a noun (e.g. the big dog).
1. (extraordinary)
a. asombroso
It is amazing what they can do with computers nowadays.Es asombroso lo que pueden hacer con las computadoras hoy en día.
b. extraordinario
The smartphone is an amazing invention.El teléfono inteligente es un invento extraordinario.
c. increíble
Luis Suarez scored an amazing goal in tonight's match.Luis Suárez marcó un gol increíble en el partido de esta noche.
fantastic(
fahn
-
tahs
-
tihk
)An adjective is a word that describes a noun (e.g. the big dog).
1. (great)
c. fabuloso
That designer's dresses are so fantastic.Los vestidos de ese diseñador son tan fabulosos.
e. bacán (colloquial) (Southern Cone)
The food at that place is fantastic.La comida en ese lugar es bacán.
f. macanudo (colloquial) (Honduras) (Southern Cone)
Regionalism used in Honduras
Her new boyfriend is fantastic.Su nuevo novio es macanudo.
2. (fanciful)
a. fantástico
It is a fantastic tale about princesses and magic kingdoms.Es una historia fantástica sobre princesas y reinos mágicos.