It is a person who suffers from a serious personality disorder that consists of having delusions of grandeur. This person does not mind lying, exaggerating or manipulating in order to obtain their goals.
Diccionario Manual de la Lengua Española Vox
Megalomaniac,-na adj. s. m. and f. 1 applies to the person who suffers from a mental disorder which takes you to believe more important than it is. 2 Applies to the person who has an excessive desire for greatness.
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