"Many-sidednesses" refers to the quality or state of having multiple aspects or perspectives. The antonyms for the word "many-sidednesses" include words like narrow-mindedness, tunnel vision, and unidimensionality, which refer to a lack of perspective or openness to other viewpoints. Other antonyms for "many-sidednesses" include simplicity, uniformity, and sameness, which suggest a lack of complexity, multiplicity, or diversity. To be many-sided, one must embrace the richness and depth of the varied experiences, ideas, and perspectives that life has to offer, while avoiding the trap of narrow-mindedness and simplistic thinking. Developing an appreciation for the many-sidedness of life can lead to greater understanding, appreciation, and empathy for others.