Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Not acceptable; unsatisfactory.

from The Century Dictionary.

  • Not acceptable; not pleasing; not welcome; not such as will be received with pleasure; displeasing.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Not acceptable; not pleasing; not welcome; unpleasant; disagreeable; displeasing; offensive.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective unsatisfactory; not acceptable
  • adjective linguistics not conforming to accepted usage

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective not conforming to standard usage
  • adjective not adequate to give satisfaction
  • adjective used of persons or their behavior
  • adjective not acceptable; not welcome

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

un- +‎ acceptable

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