lossless

L1O1S1S1L1E1S1S1
UK/ˈlɒs.ləs/

adjective

Free from loss, especially not losing electrical energy or force.

Opposite
lossy
OriginProto-Germanic *lausaz ← Proto-Indo-European *lewHs- ← English loss →
Less commonScrabble 8
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Meanings

adjectivelossless (comparative more lossless, superlative most lossless)

comparative more lossless · superlative most lossless

  1. Free from loss, especially not losing electrical energy or force.
  2. computingNot losing information.

Synonyms & antonyms

Opposite
lossy

adjectivecharacterized by or causing no dissipation of energy

Opposite
lossy

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Englishloss
  2. Proto-Indo-European*lewh₁-
  3. Proto-Indo-European*lewHs-
  4. Proto-Germanic*leusaną
  5. Proto-Germanic*lausaz
  6. Englishlossless

From loss + -less.

Full word history & related roots →

Translations

Chinese Mandarin 無損 /无损
  • 無損 /无损 (wúsǔn)not losing information
Czech bezeztrátový
  • bezeztrátovýnot losing information
Finnish häviötön
  • häviötönnot losing information
German verlustfrei
  • verlustfreinot losing information
Hungarian veszteségmentes
  • veszteségmentesnot losing information
Japanese ロスレス
  • ロスレス (rosuresu)not losing information
Polish bezstratny
  • bezstratnynot losing information
Swedish förlustfri
  • förlustfrinot losing information
Cite this entry
APA

lossless. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/lossless

MLA

“lossless.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/lossless. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “lossless,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/lossless.

Source: lossless on Wiktionary, CC BY-SA 4.0.