Antonyms for the word "meaningfulnesses" could be "meaninglessness" or "insignificance". These words suggest a lack of purpose, value or substance. When something lacks meaningfulness, it may seem pointless or futile, while when something is insignificant, it's considered trivial or unimportant.
Other antonyms for "meaningfulnesses" may include "emptiness", "hollowness", or "worthlessness". These words indicate a sense of absence or void, which can make people feel disconnected or unfulfilled. While meaningfulness relates to a sense of purpose, these antonyms suggest a lack of purpose, leading to emptiness or hollowness in life.