The term 'postponed indefinitely' can be summarized by two crossword solutions: 'MOTHBALLED' (10 letters) and 'tabled' (6 letters). Mothballing is a process of preserving an item or object for future use, usually by storing it away in a safe place. Tabling is the act of putting an item or proposal on hold, usually for further discussion at a later date. Both terms imply that the item or proposal has been put on hold with no definite timeline for when it will be addressed again.