"quickness" in the noun sense
1. adeptness, adroitness, deftness, facility, quickness
skillful performance or ability without difficulty
"his quick adeptness was a product of good design"
"he was famous for his facility as an archer"
2. mental quickness, quickness, quick-wittedness
intelligence as revealed by an ability to give correct responses without delay
3. celerity, quickness, rapidity, rapidness, speediness
a rate that is rapid
Source: WordNet® (An amazing lexical database of English)
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