sook       
noun [ C ] Australian English uk/sʊk/ us/sʊk/
 懦夫,胆小鬼
a shy or cowardly (= not brave) child or person
  "Stop being a sook", said Jim as he pulled back on the bow.
 I know I've been blogging about how cold it is, but I am not being a sook .
 - More examples
 - Stop being a damn sook.
 - I’m not a total sook about where I sleep.
 - Now I fully admit I am a sook and a hypochondriac, but this felt like some kind of fiery needle being driven in to my knee.