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"Impredecible" is an adjective which is often translated as "unpredictable", and "predecible" is an adjective which is often translated as "predictable". Learn more about the difference between "impredecible" and "predecible" below.
impredecible(
eem
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prreh
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deh
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see
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bleh
)An adjective is a word that describes a noun (e.g., the big dog).
1. (general)
a. unpredictable 
Victorio es un hombre de carácter impredecible: a veces está tranquilo, pero a veces se pone agresivo.Victorio is a man of unpredictable nature: sometimes he's calm, but sometimes he becomes aggressive.
predecible(
preh
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deh
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see
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bleh
)An adjective is a word that describes a noun (e.g., the big dog).
1. (general)
a. predictable 
Me gustó la película pero el final me decepcionó; es demasiado predecible.I liked the movie, but found the ending disappointing. It's too predictable.