wIH; Hur'Iqngan rur
  ruthless as a Hur'q  (KGT)

(KGT 153):  the Hur'q, a race of humanoids from the Gamma Quadrant who developed a reputation as ruthless invaders who would attack other societies primarily for the purpose of robbery, stealing whatever they could and destroying the rest.

TREK TRIVIA:

"We Klingons have a reputation for ruthlessness. You will find that it is deserved. Should one Klingon soldier be killed, a thousand Organians will die. I will have order." (Kor, TOS "Errand of Mercy")

SEE ALSO:

naS             be vicious
qu'             be fierce
ral             be violent
vaQ             be aggressive
vID             be belligerent
vup             pity (v)

pung            mercy (n)