The phrase "go-with-the-flow" means to follow the current trend or pattern without any resistance. Opposite to this, there are several antonyms that denote a contrary behavior or attitude. These antonyms include being steadfast, inflexible, rigid, obstinate, non-adaptive, and resisting. Having a steadfast approach means sticking to one's principles and beliefs, regardless of the circumstances. Being inflexible signifies not being open to change or differing viewpoints. Being rigid, obstinate, or non-adaptive conveys a lack of flexibility or adaptability in any given situation. Lastly, resisting means pushing back against the current trend or pattern. These antonyms denote a fixed mindset or an unwillingness to conform to external changes or pressures, which stands in direct contrast to "go-with-the-flow".