Old English dēop

→ English deep (inherited)

→ Old English dyfan (mention)

→ Old English deoplic (suffix)

→ Old English deopnes (suffix)

→ Old English deoplice (affix)

→ Old English undeop (prefix)

→ Middle English depe (inherited)

→ Old High German tiof (cognate)

→ Ancient Greek βυθός (cognate)

→ Old Saxon diop (cognate)