如狼似虎

rúlángsìhǔ
  1. lit. like wolves and tigers
  2. ruthless

CEDICT

brutal and ferocious

Wiktionary

  1. 比喻威武勇勐。《水浒传．第七八回》：「如今放着这一班好弟兄，如狼似虎的人，那十节度已是背时的人了，兄长何足惧哉！」也作「如狼如虎」。
  2. 比喻极为凶暴残忍。
  3. 比喻动作迅速勐急。

重編國語辭典

Entry Composition

1 如 rú
  1. as
  2. as if
  3. such as
2 狼 láng wolf

classifiers: 匹, 隻, 條
=3 似 sì
  1. to seem
  2. to appear
  3. to resemble
  4. similar
  5. -like
  6. pseudo-
  7. (more) than
=3 似 sì old variant of 似 sì
4 虎 hǔ tiger

classifier: 隻

Related entries

吃人不吐骨头 chīrénbùtǔgǔtóu
  1. ruthless
  2. vicious and greedy
恶辣 èlà ruthless
暴戾 bàolì ruthless
狠绝 hěnjué ruthless
酷 kù
  1. ruthless
  2. strong (e.g. of wine)
  3. (loanword) cool
  4. hip
你觉得我是个酷哥吗？

Do you think of me as a cool guy?

Source: Tatoeba

凶险 xiōngxiǎn
  1. dangerous
  2. ruthless
  3. treacherous
歹毒 dǎidú
  1. vicious
  2. ruthless
  3. malevolent
杀人不眨眼 shārénbùzhǎyǎn
  1. to murder without blinking an eye (idiom)
  2. ruthless
  3. cold-blooded
毫不留情 háobùliúqíng
  1. to show no quarter
  2. ruthless
  3. relentless
无情 wúqíng
  1. pitiless
  2. ruthless
  3. merciless
  4. heartless
这是一个狗咬狗的无情世界。

It's a dog-eat-dog world.

Source: Tatoeba

严酷 yánkù
  1. bitter
  2. harsh
  3. grim
  4. ruthless
  5. severe
  6. cut-throat (competition)
汤姆的严酷考验远没有结束。

Tom's ordeal was far from over.

Source: Tatoeba

残忍 cánrěn
  1. cruel
  2. mean
  3. merciless
  4. ruthless
太残忍了。

That's very cruel.

Source: Tatoeba

赶尽杀绝 gǎnjìnshājué
  1. to kill to the last one (idiom)
  2. to exterminate
  3. to eradicate
  4. ruthless