That is a good question. org/grammar/british-grammar/adjectives_2
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That is a good question. (Good is an adjective.)
https://dictionary.cambridge.org/grammar/british-grammar/adjectives_2
Briefly, you use an adjective when you want to describe someone or something.
Ex:1- Julia is short.
2-Julia is beautiful.
Julia is a noun. It's a name of a person. 'Short' is an adjective that descries Julia's height. "beautiful" is an adjective that describes her look or appearance.
An adjective is definitely an existed concept in your