The story
- Proto-Germanic*rōkijaną
- Proto-West Germanic*rōkijan
- Old Englishrēċan
- Proto-Indo-European*lewh₁-
- Proto-Indo-European*lewHs-
- Proto-Germanic*leusaną
- Proto-Germanic*lausaz
- Old Englishrēċelēas
- Proto-Indo-European*leyg-
- Proto-Germanic*līką
- Old Englishrēċelēaslīċe
- Middle Englishreklesly
- English todayrecklessly
From Middle English reklesly, from Old English rēcelēaslīce; equivalent to reckless + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.