say it: uhn-ak-SEP-tuh-blee
unacceptably is an adverb meaning "to an unacceptable degree". It carries one recorded sense.
to an unacceptable degree
“The percentage of lead in our drinking water is unacceptably high”
Definitions, synonyms and semantic relations for unacceptably 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.