The opposite of "excites" is "calms", which means to make someone feel less excited or nervous. Another antonym is "dulls", which means to make something less interesting or exciting. "Bore" is also an antonym, which means to require no interest or attention, causing monotony or tedium. "Relaxes" is another antonym that means to free from tension or anxiety. Similarly, "soothes" may be used as an antonym, which means to provide comfort or relief from emotional distress. Other antonyms may include "depresses", "disenchants", "sedates", "quiets" and "stills".