The phrase "easily done" suggests that a task or action can be accomplished with minimal effort or difficulty. However, when considering its antonyms, one might think of words such as difficult, challenging, arduous, and laborious. These words describe tasks that require significant effort or skill to complete successfully. Other antonyms might include complex, intricate, involved, and convoluted, which suggest actions that are detailed or require careful consideration. Additionally, antonyms such as unachievable or impossible suggest tasks that may be beyond one's abilities or limits. Ultimately, the antonyms for "easily done" remind us that success often requires hard work, perseverance, and dedication.