The word "punchiest" refers to something that is particularly forceful, impactful, or powerful. As such, its antonyms would be words that suggest weakness, ineffectiveness, or lack of impact. Some possible antonyms for "punchiest" could be words like feeble, insipid, bland, weak, impotent, or tepid. These words all imply a lack of energy, intensity, or efficacy. Alternatively, one could also use antonyms like meek, timid, gentle, or soft, which suggest a more subdued or restrained approach. By using antonyms for "punchiest," one can effectively convey the opposite meaning, creating a clear contrast between strong and weak, forceful and feeble, impactful and ineffectual.