There are several synonyms that can be used to replace the term "slow-sailing". These synonyms include sluggish, leisurely, languid, creeping, tardy, and dawdling. All of these terms signify a lack of speed or a relaxed pace. When describing a ship or a vessel, one might use the term "stately" to indicate a slow and deliberate pace. However, when describing a person's actions or movements, the term "lackadaisical" might be more appropriate. Regardless of the synonym used, the general idea conveyed is that the progress being made is not swift or rapid.