So unpleasant, distasteful, or painful as to be intolerable: unbearable heat. (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 "unbearable" in a sentence
"I wouldn't be sitting there acting like I'm in unbearable pain."
"I will not tolerate his presence on the radio or t.v. I sincerely hope that Becky dies penniless, alone, neglected, in unbearable agony and rotting away in his own excrement."
"As the Governess, Elizabeth Atherton sang with restless ardour, in unbearable thrall to her charges and locked into her own battle between reality and the wispy figments of a love-starved imagination."