ultralightweight
adjective
ul·tra·light·weight ˌəl-trə-ˈlīt-ˌwāt 
: having an extremely low weight : very lightweight
Exciting new developments in ultralightweight materials and powerful rocket motors now give amateurs all the tools they need to venture toward the final frontier.
Shawn Carlson
Shawn Carlson
Word History
First Known Use
1906, in the meaning defined above
ultralightweight
adjective
as in ultralight
Synonyms & Similar Words
Relevance
- ultralight
- lightweight
- undersized
- underweight
- flimsy
- insubstantial
- undersize
- fluffy
- weightless
- feathery
- gossamer
- ethereal
- airy
- slight
- gossamery
- light
Antonyms & Near Antonyms
- heavy
- massive
- weighty
- hefty
- ponderous
- bulky
- burdensome
- voluminous
- leaden
- lumpish
- outsized
- outsize
- massy
- elephantine