Explanation
The antonym of "assiduous," meaning hardworking and persistent, is "sluggish," which means slow-moving or lazy. "Diligent" and "sedulous" are synonyms, while "indomitable" refers to unconquerable spirit, not directly opposite.
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The antonym of "assiduous," meaning hardworking and persistent, is "sluggish," which means slow-moving or lazy. "Diligent" and "sedulous" are synonyms, while "indomitable" refers to unconquerable spirit, not directly opposite.