Antonyms for the word "is puzzled" include "understands," "comprehends," "knows," "grasps," "solves," "deciphers," "figured out," and "solves the mystery." These words all imply a level of certainty and confidence in one's understanding of a situation, as opposed to the uncertainty and confusion that comes with being puzzled. Additionally, antonyms for "puzzled" might include "unconcerned," "disinterested," or "indifferent," which suggest a lack of engagement with or investment in the situation at hand. Whatever the antonym, it stands in stark contrast to the striving and seeking associated with being puzzled.