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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 the old rules in England and Wales, anyone who wanted to split swiftly had to accuse their partner in a divorce petition of desertion, adultery or unreasonable behaviour.

From BBC Apr. 5, 2022

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

This unreasonable behaviour of the weather, however, could displease no one else in Hayslope besides Mr. Craig.

From Adam Bede by George Eliot

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