Brown nosing is a term used to describe someone who excessively flatters or sucks up to another person, often in a professional setting. The act of brown-nosing is seen as insincere and manipulative. There are several antonyms for brown-nosing that describe positive behaviors and characteristics, including being honest, straightforward, and genuine. Other antonyms include being self-assured, assertive, and confident without feeling the need to flatter or manipulate others. In a professional setting, it is important to strive for authenticity and honesty rather than engaging in brown-nosing behavior. Being genuine and trustworthy will ultimately earn the respect and admiration of others.