not in keeping with (and usually undesirable for) the season; "a sudden unseasonable blizzard"; "unseasonable bright blue weather in November"季節に合わせてでない(そして、大抵好ましくない)生憎
例:a sudden unseasonable blizzard 突然の季節外れの大吹雪
badly timed; "an ill-timed intervention"; "you think my intrusion unseasonable"; "an untimely remark"; "it was the wrong moment for a joke"時機の悪い生憎