Inexpressibly bad or objectionable: unspeakable poverty. (adjective)
Not to be spoken: unspeakable thoughts. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "unspeakable" in a sentence
"This is the Tennessee Valley Unitarian Universalist Church where religious leaders say the shooting was devastating, but they also say it brought what they call unspeakable amounts of love afterwards."
"After local prejudice and the family's own emotional frailty result in unspeakable tragedy, the gravedigger's daughter, Rebecca, begins her astonishing pilgrimage into America, an odyssey of erotic risk and imaginative daring, ingenious self-invention, and, in the end, a bittersweetbut very "American" triumph."
"Being able to speak the unspeakable is very powerful."