spineless

Adjective
  1. Weak in willpower, courage or vitality (synset 302333585)
    similar to: weak - wanting in physical strength
    same as: gutless, namby-pamby, wishy-washy
  2. Lacking a backbone or spinal column (synset 302520331)
    "worms are an example of invertebrate animals"
    referred to in: zoological science, zoology - the branch of biology that studies animals
    same as: invertebrate
  3. Lacking spiny processes (synset 302286591)
    "spineless fins"
  4. Lacking thorns (synset 300147396)
    similar to: unarmed - (used of plants or animals) lacking barbs or stings or thorns
    same as: thornless

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