Negotiation adjectives are listed in this post. Each word below can often be found in front of the noun negotiation in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing NEGOTIATION.
active, actual, amicable, based, bilateral, careful, collective, commercial, complex, complicated, considerable, constant
continual, continuous, cultural, delicate, difficult, diplomatic, direct, effective, entire, extensive, final, first
formal, friendly, fruitless, further, future, hostage, immediate, important, informal, intense, international, last
late, lengthy, little, long, more, much, multilateral, mutual, new, ongoing, own, particular
peaceful, personal, political, preliminary, present, previous, principled, private, protracted, public, real, secret
separate, serious, social, subsequent, successful, such, tedious, tough, treaty, whole
Hope this word list had the adjective used with negotiation you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.