Final answer:
An adjective in German does not take an ending when it is standalone or at the end of the sentence. It takes an ending when it comes in front of a noun.
Step-by-step explanation:
In German, an adjective will not take an ending when it is standalone and not in front of a noun. However, it will take an ending when it comes in front of a noun, as it needs to agree with the gender, case, and number of the noun. Additionally, when an adjective comes at the end of the sentence, it will also not take an ending.
Learn more about Adjectives in German