adjective
adjective describes a quality or attribute of a noun, in this case 'muscle bound' describes someone who has an excessive amount of muscle mass.
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The bodybuilder was so muscle bound that he could barely bend his arms.
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That guy at the gym is seriously muscle bound - he can't even touch his toes!
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Dude, have you seen how muscle bound that guy is? It's like he's made of steel!
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Her mind was so muscle bound by fear that she couldn't think clearly.