Original vs independent vs unresearched thought

We can't guarantee our thought is original as we don't know the complete history of all thought of all people.

We can't guarantee our thought is independent, as we might have forgotten something we've read (heard, experienced, etc) and then think the thought is our own (a phenomenon called cryptomnesia).

All we can guarantee is that our thought in unresearched i.e. that what we have written is not directly copied from or paraphrased from other material.