The word "counter-act" means to oppose or neutralize the effects of something. Its antonyms would be words that convey collaboration or endorsement. Some relevant antonyms could include support, facilitate, promote, aid, assist, encourage, and empower. These words all suggest a positive action that reinforces or amplifies the effects of something, rather than opposing them. Whereas "counter-act" can sometimes denote conflict or resistance, these antonyms emphasize unity and cooperation. By focusing on expressions of consensus and shared goals, one can build collaboration and positive momentum, rather than getting stuck in confrontation or opposition.