Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unresponsiveness is a noun meaning "the quality of being unresponsive; not reacting; as a quality of people, it is marked by a failure to respond quickly or with emotion to people or events". It carries one recorded sense.
the quality of being unresponsive; not reacting; as a quality of people, it is marked by a failure to respond quickly or with emotion to people or events
“she began to recover from her numb unresponsiveness after the accident”
“in an instant all the deadness and withdrawal were wiped away”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for unresponsiveness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.