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In a manner that differs from or is opposite to one's expectations. This situation is especially maddening because it always seems to change by contraries.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
In opposition to what is expected.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.