This is the 3312th most frequent Dutch word.
illegaal
Illegal.
In this sentence, 'illegaal' is used as an adverb to describe the nature of the action 'handelde,' indicating an illegal manner of acting.
Hij handelde illegaal door documenten te vervalsen.
He acted illegally by forging documents.
Here, 'illegaal' functions as an adjective describing the noun 'villa,' specifying that the construction of the villa was not legal.
Een illegaal gebouwde villa werd door de autoriteiten gesloopt.
An illegally constructed villa was demolished by the authorities.
In this instance, 'illegaal' is a noun referring to a person who is residing or acting without legal permission or status.