Usage: wimpy 
This command sets the percentage of a character's total hit points he will
suffer before fleeing from an attacker.  The number must be from 0 to 100. 
The higher the wimpy percentage, the more likely the character will panic
upon fleeing. Certain skills and spells can avoid the more unpleasant
effects of running for your life.
For an ordered list of the descriptions:
help wimpy settings
See also: awe, flee, horror, panic, sanity