Difficult or impossible to explain or account for.(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 "inexplicable" in a sentence
"Rachel Maddow mocked a Democratic senator on her Thursday show for what she called his "inexplicable" opposition to President Obama's jobs bill."
"He said other methods of sabotage being used were what he termed inexplicable increases in prices of commodities by businesses and manufacturers here."
"Bates is still steamed at the Senate, including Senate President Peter Bragdon, for what he calls an "inexplicable flip-flop" on the bill."