Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
hypersensitised is an adjective meaning "having an allergy or peculiar or excessive susceptibility (especially to a specific factor)". It carries one recorded sense.
having an allergy or peculiar or excessive susceptibility (especially to a specific factor)
“allergic children”
“hypersensitive to pollen”
Definitions, synonyms and semantic relations for hypersensitised come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.