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unreasonable behaviour

British  

noun

  1. law conduct by a spouse sufficient to cause the irretrievable breakdown of a marriage

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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A number of other allegations relating to unreasonable behaviour by Mr Byrne and pressure to work excessive hours were not upheld, the report found.

From BBC • Apr. 28, 2022

Under current rules, one spouse has to claim the other is guilty of adultery, unreasonable behaviour or desertion.

From BBC • Apr. 9, 2019

The most common reason for divorce was "unreasonable behaviour", with 51% of women and 36% of men citing it in their divorce petitions.

From BBC • Oct. 18, 2017

Many of these can explain bizarre or unreasonable behaviour in people, so there’s plenty of options that should be considered before you start claiming a clinical diagnosis.

From The Guardian • May 10, 2017

The ladies were discussing the weather, the want of rain, the new vicar, Lady Dacre’s rheumatism, and the unreasonable behaviour of Miss Munnion.

From A Pair of Clogs by Walton, Amy

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