Adjunct adjectives are listed in this post. Each word below can often be found in front of the noun adjunct in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing ADJUNCT.
adverbial, desirable, effective, essential
excellent, great, helpful, important
indispensable, inseparable, invaluable, mere
natural, necessary, other, powerful
useful, valuable
Hope this word list had the adjective used with adjunct you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.
Please add more adjectives to make this list more complete: