Antonyms of adj strenuous

2 senses of strenuous

Sense 1
strenuous -- (characterized by or performed with much energy or force; "strenuous exercise")

INDIRECT (VIA energetic) -> lethargic, unenrgetic -- (deficient in alertness or activity; "bullfrogs became lethargic with the first cold nights")

Sense 2
arduous, straining, strenuous -- (taxing to the utmost; testing powers of endurance; "his final, straining burst of speed"; "a strenuous task"; "your willingness after these six arduous days to remain here"- F.D.Roosevelt)

INDIRECT (VIA effortful) -> effortless -- (requiring or apparently requiring no effort; "the swallows glided in an effortless way through the busy air")

Similarity of adj strenuous

2 senses of strenuous

Sense 1
strenuous -- (characterized by or performed with much energy or force; "strenuous exercise")
       => energetic (vs. lethargic) -- (possessing or exerting or displaying energy; "an energetic fund raiser for the college"; "an energetic group of hikers"; "it caused an energetic chemical reaction")

Sense 2
arduous, straining, strenuous -- (taxing to the utmost; testing powers of endurance; "his final, straining burst of speed"; "a strenuous task"; "your willingness after these six arduous days to remain here"- F.D.Roosevelt)
       => effortful (vs. effortless) -- (requiring great physical effort)