unroadworthy

As a noun terms

is .

As an adjective unroadworthy is

describing a vehicle which is not safe for use on the road.

As a noun road

is (obsolete) the act of riding on horseback.

As an adjective unroadworthy is

describing a vehicle which is not safe for use on the road.

As adjectives the difference between safe and unroadworthy

is that safe is not in danger; free from harm's reach while unroadworthy is describing a vehicle which is not safe for use on the road.

As a noun safe

is a box, usually made of metal, in which valuables can be locked for safekeeping.

As a noun vehicle

is a conveyance; a device for carrying or transporting substances, objects or individuals.

As an adjective unroadworthy is

describing a vehicle which is not safe for use on the road.