Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
desensitising is an adjective meaning "making less susceptible or sensitive to either physical or emotional stimuli". It carries one recorded sense.
making less susceptible or sensitive to either physical or emotional stimuli
Definitions, synonyms and semantic relations for desensitising come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.