How to Say "unrealistic" in Spanish
The Spanish word for “unrealistic” is “irreal” — B2 level.
English → SpanishB2
adjectiveB2
referring to expectations or plans

Examples
Tu plan para terminar el libro en un día es irreal.
Your plan to finish the book in a day is unrealistic.
Tienen unas expectativas irreales sobre el precio de la casa.
They have some unrealistic expectations about the price of the house.
Sería irreal pensar que no habrá problemas.
It would be unrealistic to think there won't be problems.
Using 'ser' with irreal
Since being unrealistic is usually seen as a characteristic of a plan or idea, use the verb 'ser' (to be) rather than 'estar'.
Confusing with 'irrealista'
Mistake: “Saying 'irrealista' for unrealistic.”
Correction: Say 'irreal' or 'poco realista'. 'Irrealista' is much less common and often sounds like a mistake.
Related Translations
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