The word "galumphed" means to move in a clumsy or heavy manner. Some possible antonyms for this word could include terms like "sashayed," "skipped," "pranced," "glided," or "sauntered." All of these words suggest movement that is graceful, smooth, or purposeful in some way, rather than awkward or lumbering. Other antonyms for "galumphed" might include terms like "tiptoed," "inched," or "crept," which imply cautious or deliberate movement, rather than energetic or exuberant action. By using these various antonyms, writers can create a range of different tones and moods in their descriptions of movement or physical activity.