1. 没有骨气的;懦弱的
If you say that someone is spineless, you mean that they are afraid to take action or oppose people when they should.

1. lacking thorns

Synonym: thornless

2. lacking spiny processes

e.g. spineless fins

3. weak in willpower, courage or vitality

Synonym: namby-pambygutlesswishy-washy

4. lacking a backbone or spinal column

e.g. worms are an example of invertebrate animals

Synonym: invertebrate