- seasonable (adj.)
- "suitable as to the time or season," late 14c., from season (n.) + -able. Related: Seasonably; seasonableness.
- unseasonable (adj.)
- mid-15c., "inopportune," from un- (1) "not" + seasonable (adj.). In reference to weather, "not appropriate to the time of year," it is recorded from 1510s. Related: Unseasonably.