The word "most hellacious" is an intense, hyperbolic term that refers to something extremely difficult, unpleasant, or remarkable. Its antonyms would be words that imply the opposite or more positive connotations. Some antonyms for "most hellacious" could be "pleasant," "calm," "smooth," "easy," or "simple." These adjectives denote a sense of ease, relaxation, or mildness, which are the opposite of the extreme and challenging nature of the original term. For instance, a person might say, "The hike was pleasantly moderate," or "The party was calm and cozy," as an antonym for "most hellacious." Overall, antonyms for "most hellacious" offer a different perspective and showcase the diversity of language.