Herculean tasks are exceedingly challenging and require immense strength and effort to accomplish. Therefore, antonyms for herculean tasks would refer to tasks that are easy, effortless or simple to accomplish. Tasks that are small, manageable, or simple would be antonyms for herculean tasks. These types of tasks do not require exceptional strength, effort, or skill to complete. Additionally, antonyms for herculean tasks could include effortless, manageable or stress-free activities that do not require much effort or energy. Therefore, the antonyms for herculean tasks are easy or manageable tasks, routines or activities.