The word "pre-monitory" refers to an advance warning or sign of something, usually something negative. Antonyms for this word include optimistic, hopeful, cheerful, positive, and encouraging. These words indicate a sense of positivity and possibility, rather than warning of potential problems. Other antonyms for pre-monitory include auspicious, fortunate, lucky, propitious, and promising, which all suggest a positive outcome or favorable circumstances. These antonyms are useful when describing a situation where there is no indication of impending danger or negativity, instead inviting an outlook of positivity and hope.