stringent

Manners are our friends
Guiding us faithfully
In a world of mass confusion
And odd complexity.
But, if we stringently adhere
To our own detriment;
We can cut off any feeling
And kill all sentiment.
So say your "please and thank yous"
And let kindness win the day,
But tell the wankers "Go to hell"
When there is no other way.
For manners are a guideline
And should always be used first,
But some people don't deserve them
For some people are the worst.