Etymon
itc-dis-latin-dis-protoindoeuropean-bher-protoindoeuropean-bhereti-protoitalic-fero-latin-fero-latin-differo-latin-differens-latin-indifferens-old-french-indifferent-english-indifferent-protogermanic-in-protoindoeuropean-h2-protoindoeuropean-eh2-protoindoeuropean-yeti-protoindoeuropean-eh2yeti-protoindoeuropean-h2ti-protogermanic-ona-protogermanic-inona-protoindoeuropean-dye-protogermanic-atjana-protoindoeuropean-tus-protogermanic-uz-protogermanic-assuz-protogermanic-inassuz-protowest-germanic-nassi-old-english-nes-middle-english-nesse-english-ness-english-indifferentness-from-indifferent-ness
A dedicated page for this root is on the way — it will gather every word descended from it, sibling forms across daughter languages, and a branching map of the family tree.