1. Weak in willpower, courage or vitality
   - namby-pamby, gutless, wishy-washy 
2. Lacking a backbone or spinal column
   - invertebrate 
3. Lacking spiny processes
   "spineless fins" 
4. Lacking thorns
   - thornless

See also: spinelessness, unarmed, weak

Antonym: spinous

• contact sport
• contadino
• contagion
• contagious
• contagious abortion
• contagious disease
• contagiously
• contagiousness
• contain
• containable
• contained
• container
• container vessel
• containerful
• containerisation
• containerise
• containerization
• containerize
• containership
• containment
• contaminant
• contaminate
• contaminated
• contaminating
• contamination