- intractability (n.)
[intractability 词源字典]
- 1570s, from intractable + -ity.[intractability etymology, intractability origin, 英语词源]
- retractability
- "Ability (of a component part) to be retracted", Mid 19th cent.; earliest use found in The Penny Magazine. From retractable + -ity: see -bility.