(adj) not in keeping with (and usually undesirable for) the season, Ant. seasonable, Example:a sudden unseasonable blizzard; unseasonable bright blue weather in November
(adj) badly timed, Syn. wrong, unseasonable, untimely, Example:an ill-timed intervention; you think my intrusion unseasonable; an untimely remark; it was the wrong moment for a joke
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
a. Not seasonable; being, done, or occurring out of the proper season; ill-timed; untimely; too early or too late; as, he called at an unseasonable hour; unseasonable advice; unseasonable frosts; unseasonable food. -- Un*sea"son*a*ble*ness, n. -- Un*sea"son*a*bly, adv. [ 1913 Webster ]