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Definition of invertebrate : 1. Destitute of a backbone; having no vertebrae; of or pertaining to the Invertebrata.
2. One of the Invertebrata.

Synonyms:

soft, wimpish, bear, adult, big game, nerveless, limp-wristed, weakling, arthropod, characterless, beast of burden, thornless, wet, spineless, frail, wimpy, milk-and-water, arachnid, weakened, namby-pamby, weak-kneed, biped, gutless, effete, wishy-washy

fish, wildlife, marsupial, insect, ruminant, canine, amphibian, livestock, carnivore, animal, mammal, bird, creature, beast, rodent, vermin, vertebrate, brute, reptile, herbivore, feline

indecisive, cowardly, weak, irresolute

Usage examples:

• Acting upon suspicion only, I told Poundstone I was prepared to send him to the rock- pile if he didn't behave himself in the matter of my permanent franchise for the N. C. O.- and the oily old invertebrate wept and promised me anything if I wouldn't disgrace him. - "The Valley of the Giants", Peter B. Kyne.
• The same affinity is indicated by the vertebrate and invertebrate animals. - "The Student's Elements of Geology", Sir Charles Lyell.
• Proterozoic, the age of invertebrate dominance, containing an early and a late ice age. - "Unexplored!", Allen Chaffee.