say it: im-pruh-PRAHY-uh-tee
impropriety is a noun meaning "an improper demeanor". It carries 4 recorded senses.
an improper demeanor
the condition of being improper
an indecent or improper act
an act of undue intimacy
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 impropriety 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.