The word "uncrazy" means to be stable or sane, so antonyms for this would be related to madness or instability. Some possible antonyms could be crazy, insane, unstable, unpredictable, erratic, deranged, unhinged, neurotic, craze, and bonkers. Each of these words suggests a lack of control over one's thoughts or actions, often resulting in dangerous or reckless behavior. Opposite of "uncrazy" is a broad term, and depending on the context, numerous words may apply. These antonyms can be useful in expressing contrasting ideas in writing or speech while providing a clearer understanding of a message's intent.