Without payment or charge.
Given as a courtesy at no charge:
Not subject to a given condition; exempt:
Capable of reasoning; rational:
The definition of expensive is costly or having a very high price.
At the cost of great effort, damage, sacrifice, etc.
Discharged or settled by or as by payment
Merited or earned:
Find another word for gratuitous. In this page you can discover 29 synonyms, antonyms, idiomatic expressions, and related words for gratuitous, like: for-nothing, unwarranted, unessential, gratis, complimentary, free, unnecessary, reasonable, needless, expensive and costly.