Definition of Spineless

Adjective: spineless spIn-lus

Weak in willpower, courage or vitality
"He was a spineless man with hardly a mind of his own";
- namby-pamby, gutless, wishy-washy
(zoology) lacking a backbone or spinal column
"worms are an example of spineless animals";
- invertebrate
Lacking spiny processes
"spineless fins"
Lacking thorns
- thornless