Antonyms of noun effortlessness

1 sense of effortlessness

Sense 1
effortlessness -- (the quality of requiring little effort; "such effortlessness is achieved only after hours of practice")
       Antonym of effortfulness (Sense 1)
      => effortfulness -- (the quality of requiring deliberate effort)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun effortlessness

1 sense of effortlessness

Sense 1
effortlessness -- (the quality of requiring little effort; "such effortlessness is achieved only after hours of practice")
       => ease, easiness, simplicity, simpleness -- (freedom from difficulty or hardship or effort; "he rose through the ranks with apparent ease"; "they put it into containers for ease of transportation"; "the very easiness of the deed held her back")