Many-sidedness refers to the quality of being complex, multifaceted, and versatile. The antonyms for this word would be simplicity, one-dimensionality, and uniformity. A simple solution or a singular perspective can be seen as opposite to the idea of many-sidedness. A one-dimensional view of a subject, without taking into consideration the many aspects that make it complex, can lead to oversimplification and lack of understanding. Similarly, uniformity implies that everything is the same, lacking diversity or deviation. Therefore, it is essential to embrace many-sidedness and the diversity it brings, instead of seeking a simplistic, one-dimensional, or uniform approach.