unsailed

As a noun boat

is a craft used for transportation of goods, fishing, racing, recreational cruising, or military use on or in the water, propelled by oars or outboard motor or inboard motor or by wind.

As a verb boat

is to travel by boat.

As an adjective unsailed is

not sailed, not been visited/explored by boat or ship.

As a verb sailed

is past tense of sail.

As an adjective unsailed is

not sailed, not been visited/explored by boat or ship.