Etymon
itc-dis-latin-dis-protoindoeuropean-bher-protoindoeuropean-bhereti-protoitalic-fero-latin-fero-latin-differo-latin-differens-latin-indifferens-old-french-indifferent-english-indifferent-from-old-french-indifferent
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.