Usage Note
Ilegalmente is formed from ilegal + -mente and means in a manner contrary to law. It is interchangeable with de forma ilegal in formal prose. The adverb modifies verbs and adjectives to flag an unlawful act (entró ilegalmente al país, he entered the country illegally).
Examples
"El edificio fue construido ilegalmente."
Natural Translation
The building was constructed illegally.

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