The phrase "sail through" implies ease and smoothness in completing a task or activity. Its antonyms, however, convey the opposite meaning. Words like "struggle," "stumble," "falter," "fumble," and "falter" describe difficulty, awkwardness, and incompetence in performing a task. Instead of "sailing through" a project, one may "grind to a halt," "hit a wall," or "come to grief." These antonyms remind us that not every task is easy, and sometimes it takes extra effort, perseverance, and skill to achieve our goals. They also reflect the reality that setbacks, challenges, and failures are often part of the journey towards success.