The antonyms for the word "un-labored" are plentiful. Some opposites that could be used to convey the opposite meaning of "un-labored" include: hardworking, laborious, effortful, demanding, arduous, grueling, strenuous, challenging, and difficult. These words paint a picture of tasks that require great effort, attention to detail, and time commitment. Interestingly, "un-labored" itself is not a frequently used word in normal conversation. However, understanding antonyms of a word is an essential aspect of expanding one's vocabulary and becoming a better communicator. By incorporating new words and antonyms, we can add depth and nuance to conversations and written pieces.