Grinned bear it is a phrase that means to tolerate or endure a difficult situation with a forced smile. The antonyms for this phrase would be to express genuine emotions, such as sadness, anger, or frustration. It could also mean to confront the situation head-on, rather than grin and bear it. Other antonyms for grinning and bearing it would be to seek assistance, to find a solution, or to take action to change the situation. In any case, it's important to remember that sometimes it's okay to not grin and bear it, and to find healthy ways to deal with difficult circumstances.