- predictable (adj.)
[predictable 词源字典]
- 1820, from predict + -able. Related: Predictably, which in the sense "as could have been predicted" is attested from 1914.[predictable etymology, predictable origin, 英语词源]
- unpredictable (adj.)
- 1840, from un- (1) "not" + predictable (adj.). Related: Unpredictably; unpredictability.