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English lukewarm
Old English hlēow (derived)
Danish lummer (cognate)
Danish lunken (mention)
German lauwarm (cognate)
German lau (cognate)
English luke (affix)
English warm (affix)
English lew (mention)
Middle English leukwarm (inherited)
Middle English lukewarm (mention)
Middle English lew (derived)
Faroese lýggjur (cognate)
Proto-Germanic *hliwjaz (derived)
Proto-Germanic *hlēwaz (mention)
Proto-Germanic *hlūmaz (mention)
Proto-Germanic *hleumaz (mention)
Proto-Indo-European *ḱal(w)e- (derived)
Proto-Indo-European *ḱel(w)e- (mention)
Proto-Indo-European *k(')lēw- (mention)
German Low German luukwarm (cognate)
Dutch lauw (cognate)
Saterland Frisian luukwoarm (cognate)
Swedish ljum (cognate)
Swedish ljummen (mention)
Swedish ly (mention)
Swedish ljummen (cognate)

English luke (back-formation)
English lukewarmness (suffix)
English lukewarmly (suffix)
English lukewarmish (suffix)
English lukecold (mention)
Danish lunken (link)
German lau (mention)
Middle English leuk (mention)
German Low German luukwarm (cognate)
Dutch leuk (mention)
Old Norse hlýr (link)
Saterland Frisian luukwoarm (cognate)