Answer: hurtful. A “sharp tongue” means a habit of speaking harshly or critically. “Hurtful” describes the resulting effect on others and completes the idiom coherently; the other words do not describe such speech.
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Answer: hurtful. A “sharp tongue” means a habit of speaking harshly or critically. “Hurtful” describes the resulting effect on others and completes the idiom coherently; the other words do not describe such speech.