English
Etymology
From flat + -less.
Adjective
flatless (comparative more flatless, superlative most flatless)
- Without a flat.
- That will not deflate, without flatness.
1991, Malcolm Abrams, Harriet Bernstein, More Future Stuff: Over 250 Inventions that Will Change Your Life by 2001[1]:In 1979, a California company began manufacturing a flatless polyurethane tire for wheelchairs.