When we talk about a fair quantity, we usually mean a substantial amount of something that is reasonable or suitable for a particular purpose. There are various synonyms that can be used to describe a fair quantity, such as a decent amount, a goodly number, a substantial volume, a sizable lot, a considerable quantity, a moderate number, or a notable amount. All of these words can be used interchangeably to indicate an adequate or satisfactory amount of something. Whether you need to describe the amount of food, goods, or information, using these synonyms for a fair quantity can make your writing more engaging and varied.