How to Say "crackpot" in Spanish
The Spanish word for “crackpot” is “chiflado” — B2 level.
English → SpanishB2
nounB2informal
a person with strange ideas

Examples
Ese chiflado está gritando en la calle otra vez.
That nutcase is shouting in the street again.
Mi hermana es una chiflada, siempre se ríe de todo.
My sister is a silly one; she always laughs at everything.
Adjective to Noun
It’s very common in Spanish to use an adjective (like 'chiflado') as a noun simply by adding an article (el, la, un, una). It works like saying 'the crazy one' or 'a silly one' in English.
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