Synonyms of the word

gratis

• adj. Free, without charge.
• adv. Free, without charge.

complimentary

• adj. In the nature of a compliment.
• adj. Free; provided at no charge.
• adj. With respect to the closing of a letter, formal and professional.

costless

• adj. having no cost.

free

• adj. (social) Unconstrained.
• adj. Obtainable without any payment.
• adj. (abstract) Unconstrained.
• adj. (physical) Unconstrained.
• adj. Without; not containing (what is specified); exempt; clear; liberated.
• adj. (dated) Ready; eager; acting without spurring or whipping; spirited.
• adj. (dated) Invested with a particular freedom or franchise; enjoying certain immunities or privileges; admitted…
• adj. (Britain, law, obsolete) Certain or honourable; the opposite of base.
• adj. (law) Privileged or individual; the opposite of common.
• adv. Without needing to pay.
• adv. (obsolete) Freely; willingly.
• v. (transitive) To make free; set at liberty; release; rid of that which confines, limits, embarrasses, or…
• n. (Australian rules football, Gaelic football) Abbreviation of free kick.
• n. free transfer.
• n. (hurling) The usual means of restarting play after a foul is committed, where the non-offending team restarts…

gratuitous

• adj. Given freely; unearned.
• adj. Not called for by the circumstances; uncalled-for; without reason, cause, or proof; adopted or asserted…

unpaid

• adj. Not paid for.
• adj. Of work: done without agreed payment, usually voluntarily.