the acting of being "ruthless" to an even higher intensity, so much so that you do so with lack of regard for others and common decency. When you're rufless, you don't even care.
Dude why did you just push down that little kid?
Because I'm so rufless.
1. The epitome of being in a state of general unconcern regarding the consequences of a particularly inexorable action
2. "Ruthless," as pronounced by a member of a predominantly African-American urban population
3. A vagrant, transient, or otherwise homeless person
"Did you guys really just take shots of Prestige in the library and yell out, 'Where the sluts at?!'"