As we know, an adjective is a word that modifies a noun or a pronoun by attributing a quality to it. A compound adjective and one that is comprised of two or more words. Those words are usually connected by a hyphen. For example, in the sentence "The six-year-old boy tried to cross the street on his own," we have the compound adjective "six-year-old" modifying the noun "boy".
In the sentence "The attorney general has warned people that secondhand smoke is dangerous to their well-being," the compound adjective "secondhand" is modifying the noun smoke. Secondhand is an alternative spelling for "second-hand". it is comprised of two words put together to modify a noun or a pronoun. Another example would be:
Dad saved enough money to buy me a second-hand bike back then, and I couldn't have been happier.
A compound adjective is an adjective made up of two or more words, in which either of those words can be a noun, an adverb, a verb in their past participle form or a verb in their present participle form. Most of the time, these words are joined by a hyphen. The word <em>secondhand</em>is an adjective because it describes the noun "smoke", and it is compound because it is made up f two nouns <em>second </em>and<em> hand</em>. This adjective can also be separated with a hyphen: <em>second-hand.</em>
The other word that may look like a compound adjective, but it is not one, is well-being, because it is a word made up of an adverb + the verb be in their present participle form, HOWEVER, it does not act as an adjective but as a noun.
After sealing the deal
with the devil, an angel came to him to urge him to repent and put at end the
validity of their agreement. However, Faustus was very adamant. He became blind
to his own salvation.
I hope I was able to answer your question. Have a good day.