Home › Words › S › speedworthinessspeedworthinessspeedworthiness means the ability to travel at high speed.Among words judged in Lexicurio's Arena, speedworthiness ranks #29,716 of 42,747 for Qualifying.EtymologyFrom speed + worthiness, or speedworthy + -ness.nounThe ability to travel at high speed.e.g.“The "Merchant Navy" class locomotives have lost none of their speedworthiness in the extensive rebuilding and this was certainly a good example of their prowess.” — 1959 October 7, O. S. Nock, “British Locomotive Practice and Performance”, in Railway Magazine, page 705:Definitions & examples from Wiktionary (CC BY-SA 3.0).