This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Not suitable to or appropriate for the season.

adj. Not characteristic of the time of year: unseasonable weather.

adj. Poorly timed; inopportune.

adj. Not in accordance with the season.

adj. Not seasonable; being, done, or occurring out of the proper season; ill-timed; untimely; too early or too late

Not seasonable: as, an unseasonable hour. Not suited to the time or occasion; acting at an unsuitable time; unfit; untimely; ill-timed: as, unseasonable advisers or advice.

Not agreeable to the time of the year; out of season: as, an unseasonable frost. Not in season; taken, caught, or killed out of season, and therefore unfit for food: as, unseasonable salmon.

adj. not in keeping with (and usually undesirable for) the season

adj. badly timed

"It was one of those days in June, in which our summer-hopes take umbrage at what we call unseasonable weather, though no season was ever known to pass without them."

inopportune   

seasonable   

unseasonably    unseasonableness   

ill-timed    untimely   

untimely    ill-timed    unseemly    unbecoming    inexpedient    imprudent    indiscreet    unwelcome    unwarrantable    injudicious