The phrase "are active with" refers to the state of being involved or engaged in some kind of activity or task. The antonyms for this phrase include being idle or inactive, disengaged or uninvolved, passive or indifferent. When someone is not active with something, they may be described as being lazy, unproductive, lax, or uncommitted. On the other hand, if someone is actively not doing something, they may be avoiding it or deliberately retreating from it. Ultimately, the opposite of being active with something depends on the context and the type of activity in question.