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Adverb: unacceptably  `ún-uk'sep-tub-lee
  1. To an unacceptable degree
    "The percentage of lead in our drinking water is unacceptably high"
    - intolerably

See also: acceptable

Antonym: acceptably

Nearest

unabated
unable
unable to help
unabridged
unabridged dictionary
unabused
unaccented
unacceptability
unacceptable
unacceptableness
unacceptably
unaccepted
unaccessible
unaccommodating
unaccompanied
unaccomplished
unaccountability
unaccountable
unaccountably
unaccounted
unaccounted for