Si la puerta no está abierta, está

The correct adjective to fill the blank in the sentence is:

Translation.

Adjectives in Spanish.

Adjectives are the characteristics that a noun possesses, that is, the description of the shape, color, mentality or state of mind of a particular noun.

In Spanish, these adjectives have gender (male or female) and number (singular or plural) depending on the gender and number of the noun they characterize, for example, the adjective "cerrada" used in the answer, can have the following forms:

Since the noun "puerta" is female and singular, the proper adjective to describe it is "cerrada."

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cerrada

Explanation: the question in Spanish translated to English is “If the door is not open, them is.. cerrada, which means closed in Spanish.