Old Norse sjúkr

← Old English sēoc (cognate)

← German siech (cognate)

← English sick (cognate)

← Proto-Germanic *seukaz (inherited)

← Old High German sioh (cognate)

→ Old English seoc (cognate)

→ Danish syge (inherited)

→ Danish syg (inherited)

→ Faroese sjúkur (derived)

→ Old Swedish siuker (inherited)

→ Old High German sioh (cognate)

→ Icelandic sjúkur (derived)

→ Norwegian Bokmål sjuk (inherited)

→ Norwegian Bokmål syk (derived)

→ Norwegian Nynorsk sjuk (inherited)

→ Old Norse sjúkdómr (suffix)

→ Old Norse sjúkleikr (suffix)

→ Old Saxon siok (cognate)

→ Swedish sjuk (inherited)