Explanation
The antonym of "ductile" is "stiff" because ductile means easily bent or shaped, while stiff means rigid and resistant to bending. The other options—pliable, supple, and docile—are all synonyms or related to flexibility, not opposites.
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The antonym of "ductile" is "stiff" because ductile means easily bent or shaped, while stiff means rigid and resistant to bending. The other options—pliable, supple, and docile—are all synonyms or related to flexibility, not opposites.