Ruthless
Ruthless refers to a lack of conscience or empathy.
Ruthless may also refer to:

Music
Ruthless!, a 1992 musical
Ruthless (Ace Hood album), 2009
Ruthless (Bizzy Bone album), 2008
Ruthless (Gary Allan album), 2021
Ruthless Records, a hip hop record label
Ruthless Records (Chicago), a punk record label

Other uses
Ruthless (film), a 1948 film starring Zachary Scott
Ruthless (horse), a racehorse
Ruthless (novel), a Pretty Little Liars novel by Sara Shepard
Ruthless: Scientology, My Son David Miscavige, and Me, a 2016 book by Ron Miscavige and Dan Koon
Ruthless (TV series), TV series premiered 2020, by Tyler Perry

See also
Ruthless Stakes, a horse race run at Aqueduct Racetrack
Tom Clancy's ruthless.com, a computer game