Antonym of effortless

Antonyms of adj effortless

2 senses of effortless

Sense 1:

effortless (vs. effortful)

effortful (vs. effortless)
arduous, backbreaking, grueling, gruelling, hard, heavy, laborious, operose, punishing, toilsomedraggingexhausting, tiring, wearing, wearyingheavy, labored, labouredlabor-intensive, labour-intensiveleaden, ploddingSisypheanarduous, straining, strenuous

Sense 2:

casual, effortless

INDIRECT (VIA easy) -> difficult, hard