1. 熟练：adept 熟练的 | adeptness 熟练 | adequacy 适当

2. 熟练, 老练：adeptism || 重用专家的作风, 用人唯贤 | adeptness || 熟练, 老练 | adequacy || 适当, 足够

noun

1. skillful performance or ability without difficulty

    e.g. his quick adeptness was a product of good design
           he was famous for his facility as an archer

    Synonym: adroitnessdeftnessfacilityquickness