The term "more petrifying" refers to something which is more terrifying or frightening than something else. Antonyms for this term would include words that describe a lack of fear or a sense of safety. For example, the words calm, peaceful, serene, relaxed, and soothing would be antonyms. Other antonyms could include words that describe things that are exciting or pleasant, such as adventurous, thrilling, fun, exciting, or enjoyable. Other antonyms could include words that describe things that are safe, secure, or comforting, such as protective, reassuring, stable, secure, or cozy. Essentially, any word that implies safety or the absence of danger could be used as an antonym for "more petrifying.