Definitions

1. adjective

lacking a cup, or unsuitable for holding a cup of liquid

“This coffee shop is cupless, so you’ll need to bring your own container.”

2. adjective

having no cups or being without cups

“The vending machine is cupless and only dispenses dry snacks.”

3. noun

a person who is cupless, especially as a user of a vending machine

“The company apologized to its cupless customers for the inconvenience.”