Synonyms for Clumsiness (same or very similar meaning)
WordNet sense 1 (unskillfulness resulting from a lack of training):
awkwardness, ineptitude, ineptness, maladroitness, slownessWordNet sense 2 (the inelegance of someone stiff and unrelaxed (as by embarrassment)):
gracelessness, stiffnessFrom the ODE community, based on WordNetadd/edit