Where does “sonderli” come from?

sonderli (Middle English) comes from Old English synderlīċ, from Old English -līċ, from Proto-Germanic *-līk.

Ancestry of “sonderli”, step by step

sonderli traces back through two separate lines of ancestry.

via Old English synderlīċ

StepLanguageWordMeaning
1Old Englishsynderlīċspecial
2Old English-līċsuffix forming {{glossary|adjective}}s meaning...
3Proto-Germanic*-līk

via Old English sundorlīċ

StepLanguageWordMeaning
1Old Englishsundorlīċ
Every word from Proto-Germanic *-līkEvery word from Old English -līċEvery word from Old English synderlīċ