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Adjective: spineless  spIn-lus
  1. Weak in willpower, courage or vitality
    "He was a spineless man with hardly a mind of his own";
    - namby-pamby, gutless, wishy-washy
     
  2. (zoology) lacking a backbone or spinal column
    "worms are an example of spineless animals";
    - invertebrate
     
  3. Lacking spiny processes
    "spineless fins"
     
  4. Lacking thorns
    - thornless

See also: unarmed, weak

Antonym: spinous

Encyclopedia: Spineless