How to Say "hideous creature" in Spanish
The Spanish word for “hideous creature” is “monstruo” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
nounA2
something deformed or physically frightening

Examples
El monstruo marino tenía ojos rojos y dientes afilados.
The sea monster had red eyes and sharp teeth.
Pensaban que había un monstruo viviendo en el pantano.
They thought there was a monster living in the swamp.
Gender Note
Even though 'monstruo' ends in 'o', it can refer to a creature of any gender (male or female). You always use the masculine article: 'el monstruo'.
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