Definitions from Wiktionary (invertebrate)

▸ noun:  An animal without vertebrae, i.e. backbone.
▸ noun:  (informal) A spineless person; a coward.
▸ adjective:  Lacking a backbone; without vertebrae.
▸ adjective:  Cowardly, uncourageous; lacking character.
▸ Also see invertebrate

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