The word "bendablenesses" refers to the quality of being flexible or adaptable. Its antonyms would be words that describe the opposite quality, such as inflexibility, rigidity, or inadaptability. A rigid object is unable to bend or change shape, while an inflexible person is unwilling to change their opinions or actions. Inadaptability implies an inability to adjust to new circumstances, which can hinder growth and progress. Therefore, antonyms for "bendablenesses" are words that generally connote an unwillingness or inability to change or adjust to new situations, ideas, or opinions.