On no condition
Definition 1 of 1
Pro Tip 1/3Absolute Prohibition
Emphasizes something is strictly forbidden, with a strong tone of warning or restriction. 
On no condition are you allowed to enter that restricted area.
Pro Tip 2/3No Exceptions
Indicates a rule or statement applies universally, without any exceptions whatsoever. 
On no condition will late submissions be accepted for this project.
Pro Tip 3/3Serious Contexts
Mostly used in serious or formal contexts, often related to rules, laws, or safety. 
On no condition should confidential information be disclosed to outsiders.