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spineless (adj.)

1827 of animals (1805 of plants), from spine + -less. Meaning "lacking moral force" is from 1885. Related: Spinelessly; spinelessness.

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Definitions of spineless

spineless (adj.)
weak in willpower, courage or vitality;
spineless (adj.)
lacking a backbone or spinal column;
Synonyms: invertebrate
spineless (adj.)
lacking spiny processes;
spineless fins
spineless (adj.)
lacking thorns;
Synonyms: thornless
From wordnet.princeton.edu