(as) artful as a wagonload of monkeys British informal simile
Extremely clever, cunning or mischievous
Don't let his shy and obedient appearance fool you. He is as artful as a wagonload of monkeys.
The children are as artful as a wagonload of monkeys, so you must keep an eye on them.
White lie
It is believed that someone who has engaged in immoral behavior will always be be prone to it
a person who treats other people badly and unfairly, a despicable person
Used to allude that the last force, problem or burden which is seemingly minor and small causes a person, system or organisation to collapse or fail
Her husband's violent act last night was the straw that broke the donkey's back and she left him