Antonyms of adj muscle-bound

1 sense of muscle-bound

Sense 1
muscle-bound -- (having stiff muscles as the result of excessive exercise; "he arrived accompanied by two muscle-bound body guards")

INDIRECT (VIA inflexible) -> flexible, flexile -- (able to flex; able to bend easily; "slim flexible birches")

Similarity of adj muscle-bound

1 sense of muscle-bound

Sense 1
muscle-bound -- (having stiff muscles as the result of excessive exercise; "he arrived accompanied by two muscle-bound body guards")
       => inflexible (vs. flexible) -- (resistant to being bent; "an inflexible iron bar"; "an inflexible knife blade";)