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Adjective: unseasonable  ,ún'see-zu-nu-bul
  1. Not in keeping with (and usually undesirable for) the season
    "a sudden unseasonable blizzard"; "unseasonable bright blue weather in November"
  2. Badly timed
    "you think my intrusion unseasonable";
    - ill-timed, untimely, wrong

See also: inopportune

Antonym: seasonable