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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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He is, though, expected to say that he doesn't condone unreasonable behaviour or language.

From BBC Dec. 1, 2023

Instead, Amy had to apply to end the relationship on the grounds of "unreasonable behaviour", a process she found incredibly difficult.

From BBC Oct. 6, 2021

Mr Leakey, who was responsible for keeping order in the House of Lords, told BBC Newsnight in 2018 that he had seen "bullying and unreasonable" behaviour.

From BBC Jan. 30, 2020

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

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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