The antonyms for the word "more blusterous" could be calm, serene, peaceful, tranquil, composed, and placid. Blusterous refers to something that is aggressively loud and stormy, so the opposite of blusterous would be something that is quiet and peaceful. The antonyms of blusterous signify a state of stillness, tranquility, and peace. The calmness of a person minus the loud and aggressive behavior can result in composure. The placid atmosphere can generate a serene feeling, and a tranquil environment can bring peace of mind. Thus, these antonyms carry a different connotation than the word "blustery" and can make a perfect combination in storytelling or conversation.