spineless spineless /ˈspaɪnləs/

adjective

1. () Weak in willpower, courage or vitality  ( gutless , namby-pamby [Informal] , wishy-washy [Informal] , spineless )
   weak in willpower, courage or vitality
   
2. Lacking thorns  ( spineless , thornless )
   lacking thorns
   
3. Lacking spiny processes  ( spineless )
   lacking spiny processes
    Spineless fins
   spineless fins
   
4. (zoology) lacking a backbone or spinal column  ( invertebrate , spineless )
   (zoology) lacking a backbone or spinal column
    Worms are an example of invertebrate animals
   worms are an example of invertebrate animals