Open English Wordnet
Nouns
(n)awkwardness, clumsiness, ineptness, ineptitude, maladroitness, slownessunskillfulness resulting from a lack of training
(n)slowness, deliberation, deliberateness, unhurriednessa rate demonstrating an absence of haste or hurry
(n)retardation, mental retardation, backwardness, slowness, subnormalitylack of normal development of intellectual capacities