1. having no port or harbor; lacking a port of call
Usage: nautical; rare
2. without a port or opening; not having a port or aperture
Usage: technical; rare

Examples

• The portless coast offered no shelter for the damaged vessel.
• Early explorers feared sailing along portless stretches of the ocean.
• The portless design of the engine block prevented any external connections.
• Ships avoided the portless regions of the archipelago during storm season.