Antonyms of adv unacceptably

1 sense of unacceptably

Sense 1
unacceptably, intolerably -- (to an unacceptable degree; "The percentage of lead in our drinking water is unacceptably high")
       Antonym of acceptably (Sense 1)
      => acceptably, tolerably, so-so -- (in an acceptable (but not outstanding) manner; "she plays tennis tolerably")

Synonyms of adv unacceptably

1 sense of unacceptably

Sense 1
unacceptably, intolerably -- (to an unacceptable degree; "The percentage of lead in our drinking water is unacceptably high")