Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unseasonable is an adjective meaning "not in keeping with (and usually undesirable for) the season". It carries 2 recorded senses.
not in keeping with (and usually undesirable for) the season
“a sudden unseasonable blizzard”
“unseasonable bright blue weather in November”
badly timed
“an ill-timed intervention”
“you think my intrusion unseasonable”
“an untimely remark”
“it was the wrong moment for a joke”
Definitions, synonyms and semantic relations for unseasonable come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.