unthought adjective 1noun 1forms 1 adjective1 •Not having been thought.For Bion it is not thinking which produces thoughts but unthought thoughts which require an apparatus for thinking them. — 1995 noun1 •That which has not been (yet) thought; that which has yet to enter into the mind; a non-existent thought.But without his knowing, they interfere with his research and at the very least call on him to put the results in perspective. This is what we call the “unthoughts” of scientific work. — 2011 formsunthoughts