How to Say "lawfulness" in Spanish
The Spanish word for “lawfulness” is “legalidad” — B1 level. This is a very common word in everyday Spanish.

Examples
Dudamos de la legalidad de ese contrato.
We doubt the legality of that contract.
Todo se hizo dentro de la legalidad vigente.
Everything was done within the current legal framework.
El abogado cuestionó la legalidad de las pruebas presentadas.
The lawyer questioned the lawfulness of the evidence presented.
The '-dad' Rule
Words ending in '-dad' (like legalidad, ciudad, or realidad) are almost always feminine. This means you should always use 'la' or 'una' with them.
Abstract Nouns and Articles
In Spanish, we use the article 'la' when talking about abstract concepts like 'legality' in general, even when English skips it. Example: 'La legalidad es importante' (Legality is important).
Gender confusion
Mistake: “El legalidad es importante.”
Correction: La legalidad es importante. Because the word ends in -dad, it is feminine.
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