say it: di-FEN-siv-nuhs
defensiveness is a noun meaning "excessive sensitivity to criticism". It carries one recorded sense.
excessive sensitivity to criticism
“his defensiveness was manifested in hurt silence”
“the fear of being sued for malpractice has magnified physicians' defensiveness”
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 defensiveness come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.