Antonyms of adj sickly

2 senses of sickly

Sense 1
sallow, sickly -- (unhealthy looking)

INDIRECT (VIA unhealthy) -> healthy -- (having or indicating good health in body or mind; free from infirmity or disease; "a rosy healthy baby"; "staying fit and healthy")

Sense 2
ailing, indisposed, peaked (predicate), poorly (predicate), sickly, unwell, under the weather, seedy -- (somewhat ill or prone to illness; "my poor ailing grandmother"; "feeling a bit indisposed today"; "you look a little peaked"; "feeling poorly"; "a sickly child"; "is unwell and can't come to work")

INDIRECT (VIA ill) -> well -- (in good health especially after having suffered illness or injury; "appears to be entirely well"; "the wound is nearly well"; "a well man"; "I think I'm well; at least I feel well")

Similarity of adj sickly

2 senses of sickly

Sense 1
sallow, sickly -- (unhealthy looking)
       => unhealthy (vs. healthy) -- (not in or exhibiting good health in body or mind; "unhealthy ulcers")

Sense 2
ailing, indisposed, peaked (predicate), poorly (predicate), sickly, unwell, under the weather, seedy -- (somewhat ill or prone to illness; "my poor ailing grandmother"; "feeling a bit indisposed today"; "you look a little peaked"; "feeling poorly"; "a sickly child"; "is unwell and can't come to work")
       => ill (vs. well), sick -- (affected by an impairment of normal physical or mental function; "ill from the monotony of his suffering")