Synonyms for Backbone

Synonyms starting with letter I

• intestinal fortitude

  strength of character
• intrepidity
• integrity

  fortitude
• indefatigability
• indomitability
• intrepidness
• iron will
• intransigence
• inflexibility
• immovability
• immobility
• independence
• imperishability
• impudence
• impertinence
• insolence
• imperturbability
• infrastructure
• important part
• invincibility
• indomitableness
• intentness
• initiative
• ingenuity
• 

  imagination
• inclination
• intention
• insistence
• immutability
• incivility
• impudency
• incorruptibility
• indestructibility
• immortality
• iron
• ivory

  bones