Unhandinesses is a difficult word to find synonyms for, as it is quite uncommon. However, possible alternatives include clumsiness, awkwardness, ineptitude, inelegance, and maladroitness. These words all share the general idea of a lack of ease or dexterity in handling objects or performing tasks. "Clumsiness" suggests a tendency to drop or bump into things, while "awkwardness" implies a lack of grace or coordination in movement. "Ineptitude" and "maladroitness" both refer to a general inability to perform tasks effectively, with "ineptitude" focusing on a lack of skill or aptitude, and "maladroitness" emphasizing a lack of coordination. "Inelegance" can describe an overall lack of refinement or grace in movement or execution.