Gratuitous
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
Without valuable or le-gui consideration. A term applied to deeds of conveyance and to bailments and other contracts.
In old English law
Voluntary; without force, fear, or favor. Bract, fols.
11, 17.
As to gratuitous "Bailment," "Contract," and "Deposit," see those titles.