"slowness" in the noun sense
1. awkwardness, clumsiness, ineptness, ineptitude, maladroitness, slowness
unskillfulness resulting from a lack of training
2. slowness, deliberation, deliberateness, unhurriedness
a rate demonstrating an absence of haste or hurry
3. retardation, mental retardation, backwardness, slowness, subnormality
lack of normal development of intellectual capacities
Source: WordNet® (An amazing lexical database of English)
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