Main entry: spineless, invertebrate
Definition: lacking a backbone or spinal column
Usage: worms are an example of invertebrate animals
Antonyms: vertebrate
Definition: having a backbone or spinal column
Main entry: spineless
Definition: lacking spiny processes
Usage: spineless fins
Main entry: thornless, spineless
Definition: lacking thorns
Antonyms: armed
Definition: (used of persons or the military) characterized by having or bearing arms
Antonyms: armed
Definition: (used of plants and animals) furnished with bristles and thorns
Main entry: spineless, wishy-washy, gutless, namby-pamby
Definition: weak in willpower, courage or vitality
Antonyms: strong
Definition: having strength or power greater than average or expected