is similar to
free of charge
"if they deposit these shares in the scheme they will get further buckshee shares on a one-for-one basis"- Economist
is similar to
costing nothing
"complimentary tickets"; "free admission"
is similar to
paying nothing
"non-paying guests"; "non-paying bidders on eBay"
is similar to
owed as a debt
"outstanding bills"; "the amount still owed"; "undischarged debts"
is similar to
done for the public good without compensation
is similar to
complimentary; without payment of rent
"with the job came a rent-free apartment"
is similar to
not paying a salary
"an uncompensated federal post"
see also
owed and payable immediately or on demand
"payment is due"