"spineless" in the adjective sense
1. namby-pamby, gutless, spineless, wishy-washy
weak in willpower, courage or vitality
2. invertebrate, spineless
lacking a backbone or spinal column
"worms are an example of invertebrate animals"
3. spineless
lacking spiny processes
"spineless fins"
4. thornless, spineless
lacking thorns
Source: WordNet® (An amazing lexical database of English)
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