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

See also: unarmed, weak

Antonym: spinous