Dictionary.com
Thesaurus.com

bastardry

American  
[bas-ter-dree] / ˈbæs tər dri /

noun

Australia and New Zealand.

  1. unpleasant, often aggressive behavior.

bastardry British  
/ ˈbæs-, ˈbɑːstədrɪ /

noun

  1. slang malicious or cruel behaviour

"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

Etymology

Origin of bastardry

1635–45, for earlier sense; bastard + -ry

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.