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1.
A wimp. A person without a spine. Someone who has others do the dirty work for them. Someone who backs down from confrontation or sneaks around and has others do the job for them.
1. Look at that kid who had his friend beat his enemy up.

2. Vitale hired someone else to abuse his ex. What a spineless sack of shit.
by Dthrone March 05, 2008
 
2.
When someone is overcontrolled by their girlfriend and does anything she says to do without regard for himself.
She says "jump", he says, "how high and far" showing the lack of a spine - spineless

When Parker W. goes to his g/f's hometown at 12:30 in the morning and tells his buddies that he's going to the gas station to get something to drink!
by Dr. Johns April 23, 2007
 
3.
a spineless loser is someone that feeds off of other people. They are selfish and manipulative. They do not have a conscience of their own so they play on others consciences to get what they want.
A spineless loser is someone that "borrows" money from people still to weak to say NO for whatever reason and never pays it back.
by mwallace270 January 22, 2012